Paging,RowDataBound of a gridview with in a gridview.

Html Code:

<asp:GridView ID="grdvCommonCore" runat="server" AutoGenerateColumns="False"
OnRowDataBound="grdvCommonCore_RowDataBound"
    Width="100%" AllowPaging="True" PageSize="5">
    <AlternatingRowStyle CssClass="GridAltRowStyle" />
    <Columns>
        <asp:TemplateField HeaderText="Course Name,AU Value and Department">
            <ItemTemplate>
                <asp:GridView ID="grdvCommonCoreCourses" runat="server"
                OnRowDataBound="grdvCommonCoreCourses_RowDataBound"
                    AllowPaging="true" PageSize="10" AutoGenerateColumns="False"
                Width="100%" OnPageIndexChanging="grdvCommonCoreCourses_PageIndexChanging"
                    OnRowCommand="grdvCommonCoreCourses_RowCommand">
                    <HeaderStyle CssClass="GridHeaderStyle" />
                    <RowStyle CssClass="GridRowStyle" />
                    <AlternatingRowStyle CssClass="GridAltRowStyle" />
                    <Columns>
                        <asp:TemplateField HeaderText="Delete">
                            <ItemTemplate>
                                <asp:ImageButton ID="imgDelete" runat="server"
                             ImageUrl="~/images/Cross.png" /></ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField Visible="False">
                            <ItemTemplate>
                                <asp:Label ID="lblCommonCoreCoursesId" runat="server"></asp:Label></ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Course Name">
                            <ItemTemplate>
                                <asp:Label ID="lblCommonCoreCourses" runat="server"></asp:Label></ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="AU Value">
                            <ItemTemplate>
                                <asp:Label ID="lblCommonCoreAUvalue" runat="server"></asp:Label></ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Department Name">
                            <ItemTemplate>
                                <asp:Label ID="lblCommonCoreDepeartment" runat="server"></asp:Label></ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="No Of Compulsory Courses">
            <ItemTemplate>
                <asp:Label ID="lblCommonCoreCoursesNo" runat="server"></asp:Label></ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Total AU Value">
            <ItemTemplate>
                <asp:Label ID="lblCommonCoreAUValue" runat="server"></asp:Label></ItemTemplate>
        </asp:TemplateField>
    </Columns>
    <EmptyDataTemplate>
        No Course Found</EmptyDataTemplate>
    <HeaderStyle CssClass="GridHeaderStyle" />
    <RowStyle CssClass="GridRowStyle" />
</asp:GridView>

C# Coding Section:

public void ShowProgram()
{
IEnumerable<LINQ.ProgramRequirementMap> objCommonCoreProgramRequirementMap = BLL.ProgramRequirementMap.GetProgramRequirementByProgramId
      (Convert.ToInt32(hdnProgramId.Value), Constants.ProgramConstrainType.CommonCore.ToString());
if (objCommonCoreProgramRequirementMap.Count() > 0)
    grdvCommonCore.DataSource = objCommonCoreProgramRequirementMap;
else
    grdvCommonCore.DataSource = null;
grdvCommonCore.DataBind();
}

protected void grdvCommonCore_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
    GridView grdvCommonCoreCourses = (GridView)e.Row.FindControl("grdvCommonCoreCourses");
    Label lblCommonCoreCoursesNo = (Label)e.Row.FindControl("lblCommonCoreCoursesNo");
    Label lblCommonCoreAUValue = (Label)e.Row.FindControl("lblCommonCoreAUValue");

    List<LINQ.CourseProgramRequirementMap> objCommonCoreProgramRequirementMap = BLL.CourseProgramRequirementMap.GetCoursesAccordingRequirement
           ((Convert.ToInt32(hdnProgramId.Value)), Constants.ProgramConstrainType.CommonCore.ToString());

    if (grdvCommonCoreCourses != null)
    {
        if (objCommonCoreProgramRequirementMap.Count() > 0)
        {
            hdvCommonCompulsoryNo.Value = objCommonCoreProgramRequirementMap.Count().ToString();
            ShowCommonCourses(grdvCommonCoreCourses);
        }
    }
    if (lblCommonCoreCoursesNo != null)
        lblCommonCoreCoursesNo.Text = objCommonCoreProgramRequirementMap.Count() + " Of " + objCommonCoreProgramRequirementMap.Count();

    if (lblCommonCoreAUValue != null)
        lblCommonCoreAUValue.Text = doubleCommonCoreAUValue.ToString();
}
}

public void ShowCommonCourses(GridView grdvCommonCoreCourses)
{
List<LINQ.CourseProgramRequirementMap> objCommonCoreProgramRequirementMap = BLL.CourseProgramRequirementMap.GetCoursesAccordingRequirement
       ((Convert.ToInt32(hdnProgramId.Value)), Constants.ProgramConstrainType.CommonCore.ToString());

if (objCommonCoreProgramRequirementMap.Count() > 0)
{
    grdvCommonCoreCourses.DataSource = objCommonCoreProgramRequirementMap;
}
else
{
    grdvCommonCoreCourses.DataSource = null;
}
doubleCommonCoreAUValue = 0.0;
grdvCommonCoreCourses.DataBind();
}

protected void grdvCommonCoreCourses_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
    ImageButton imgDelete = (ImageButton)e.Row.FindControl("imgDelete");
    Label lblCommonCoreCoursesId = (Label)e.Row.FindControl("lblCommonCoreCoursesId");
    Label lblCommonCoreCourses = (Label)e.Row.FindControl("lblCommonCoreCourses");
    Label lblCommonCoreAUvalue = (Label)e.Row.FindControl("lblCommonCoreAUvalue");
    Label lblCommonCoreDepeartment = (Label)e.Row.FindControl("lblCommonCoreDepeartment");

    if (imgDelete != null)
    {
        imgDelete.CommandName = "DeleteCourse";
        imgDelete.CommandArgument = ((LINQ.CourseProgramRequirementMap)e.Row.DataItem).CourseId.ToString();
        imgDelete.OnClientClick = "return confirm('Are you sure you want to delete the Course from program?It will effect all the programs.');";
    }

    if (lblCommonCoreCoursesId != null)
        lblCommonCoreCoursesId.Text = ((LINQ.CourseProgramRequirementMap)e.Row.DataItem).CourseId.ToString();


    if (lblCommonCoreCourses != null)
        lblCommonCoreCourses.Text = ((LINQ.CourseProgramRequirementMap)e.Row.DataItem).Course.Abbreviation;

    if (lblCommonCoreAUvalue != null)
    {
        lblCommonCoreAUvalue.Text = BLL.CourseCategoryMap.getAuValue(Convert.ToInt32(lblCommonCoreCoursesId.Text));
        doubleCommonCoreAUValue = doubleCommonCoreAUValue + Convert.ToDouble(lblCommonCoreAUvalue.Text.Trim());
    }

    if (lblCommonCoreDepeartment != null)
        lblCommonCoreDepeartment.Text = ((LINQ.CourseProgramRequirementMap)e.Row.DataItem).Course.CourseAbbreviation.Department.DepartmentName;
}
}

protected void grdvCommonCoreCourses_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView grdvCommonCoreCourses = null;
foreach (GridViewRow row in grdvCommonCore.Rows)
{
    grdvCommonCoreCourses = (GridView)(row.Cells[0].FindControl("grdvCommonCoreCourses"));
}
grdvCommonCoreCourses.PageIndex = e.NewPageIndex;
ShowCommonCourses(grdvCommonCoreCourses);
tabProgramInfo.ActiveTabIndex = 1;
}

protected void grdvCommonCoreCourses_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("DeleteCourse"))
{
    BLL.ProgramRequirement.Delete(Convert.ToInt32(e.CommandArgument.ToString()), Convert.ToInt32(hdnProgramId.Value),
                                  BLL.Constants.ProgramConstrainType.CommonCore.ToString());
    ShowProgram();
}
}

GridView Edit/Delete and Bind

Html Section:

<asp:GridView ID="grdvBook" runat="server" AutoGenerateColumns="false" OnRowDataBound="grdvBook_RowDataBound"
    OnRowEditing="grdvBook_RowEditing" OnRowCancelingEdit="grdvBook_RowCancelingEdit"
    OnRowUpdating="grdvBook_RowUpdating" OnRowDeleting="grdvBook_RowDeleting">
   <Columns>
       <asp:TemplateField HeaderText="Author">
           <ItemTemplate>
               <asp:Label ID="lblBookId" runat="server" Visible="false"></asp:Label>
               <asp:Label ID="lblAuthor" runat="server"></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
               <asp:TextBox ID="txtBookId" runat="server" Visible="false"></asp:TextBox>
               <asp:TextBox ID="txtAuthor" runat="server"></asp:TextBox>
           </EditItemTemplate>
           <ControlStyle Width="125px"></ControlStyle>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="ISBN">
           <ItemTemplate>
               <asp:Label ID="lblISBN" runat="server"></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
               <asp:TextBox ID="txtISBN" runat="server"></asp:TextBox>
           </EditItemTemplate>
           <ControlStyle Width="80px"></ControlStyle>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="Year">
           <ItemTemplate>
               <asp:Label ID="lblYear" runat="server"></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
               <asp:TextBox ID="txtYear" runat="server"></asp:TextBox>
           </EditItemTemplate>
           <ControlStyle Width="40px"></ControlStyle>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="Title">
           <ItemTemplate>
               <asp:Label ID="lblTitle" runat="server"></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
               <asp:TextBox ID="txtTitle" runat="server"></asp:TextBox>
           </EditItemTemplate>
           <ControlStyle Width="125px"></ControlStyle>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="Edition">
           <ItemTemplate>
               <asp:Label ID="lblEdition" runat="server"></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
               <asp:TextBox ID="txtEdition" runat="server"></asp:TextBox>
           </EditItemTemplate>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="Edit">
           <ItemTemplate>
               <asp:ImageButton ID="imgEdit" runat="server" ToolTip="Edit Information" CommandName="Edit"
                   ImageUrl="~/images/edit_icon.png" />
           </ItemTemplate>
           <EditItemTemplate>
               <asp:ImageButton ID="imgSave" runat="server" ImageUrl="~/images/AddEvidence.png"
                   ToolTip="Save" />
               <asp:ImageButton ID="imgCancle" runat="server" ImageUrl="~/images/cancel_icon.png"
                   ToolTip="Cancel" />
           </EditItemTemplate>
       </asp:TemplateField>
       <asp:TemplateField HeaderText="Delete">
           <ItemTemplate>
               <asp:ImageButton ID="imgDelte" runat="server" ImageUrl="~/images/Cross.png" CommandName="Delete" />
           </ItemTemplate>
       </asp:TemplateField>
   </Columns>
</asp:GridView>

C # Coding Section:

protected void grdvBook_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Label lblBookId = (Label)e.Row.FindControl("lblBookId");
        Label lblAuthor = (Label)e.Row.FindControl("lblAuthor");
        Label lblISBN = (Label)e.Row.FindControl("lblISBN");
        Label lblYear = (Label)e.Row.FindControl("lblYear");
        Label lblTitle = (Label)e.Row.FindControl("lblTitle");
        Label lblEdition = (Label)e.Row.FindControl("lblEdition");

        ImageButton imgEdit = (ImageButton)e.Row.FindControl("imgEdit");
        ImageButton imgDelte = (ImageButton)e.Row.FindControl("imgDelte");

        if (lblBookId != null)
            lblBookId.Text = ((LINQ.Book)e.Row.DataItem).BookId.ToString();

        if (lblAuthor != null)
            lblAuthor.Text = ((LINQ.Book)e.Row.DataItem).Author.ToString();

        if (lblISBN != null)
            lblISBN.Text = ((LINQ.Book)e.Row.DataItem).ISBN.ToString();

        if (lblYear != null)
            lblYear.Text = ((LINQ.Book)e.Row.DataItem).Year.ToString();

        if (lblTitle != null)
            lblTitle.Text = ((LINQ.Book)e.Row.DataItem).Title.ToString();

        if (lblEdition != null)
            lblEdition.Text = ((LINQ.Book)e.Row.DataItem).Edition.ToString();

        if (imgEdit != null)
        {
            imgEdit.CommandArgument = ((LINQ.Book)e.Row.DataItem).BookId.ToString();
            imgEdit.CommandName = "Edit";
        }

        if (imgDelte != null)
        {
            imgDelte.CommandArgument = ((LINQ.Book)e.Row.DataItem).BookId.ToString();
            imgDelte.CommandName = "Delete";
        }


        TextBox txtBookId = (TextBox)e.Row.FindControl("txtBookId");
        TextBox txtAuthor = (TextBox)e.Row.FindControl("txtAuthor");
        TextBox txtISBN = (TextBox)e.Row.FindControl("txtISBN");
        TextBox txtYear = (TextBox)e.Row.FindControl("txtYear");
        TextBox txtTitle = (TextBox)e.Row.FindControl("txtTitle");
        TextBox txtEdition = (TextBox)e.Row.FindControl("txtEdition");

        ImageButton imgSave = (ImageButton)e.Row.FindControl("imgSave");
        ImageButton imgCancle = (ImageButton)e.Row.FindControl("imgCancle");

        if (txtBookId != null)
            txtBookId.Text = ((LINQ.Book)e.Row.DataItem).BookId.ToString();

        if (txtAuthor != null)
            txtAuthor.Text = ((LINQ.Book)e.Row.DataItem).Author.ToString();

        if (txtISBN != null)
            txtISBN.Text = ((LINQ.Book)e.Row.DataItem).ISBN.ToString();

        if (txtYear != null)
            txtYear.Text = ((LINQ.Book)e.Row.DataItem).Year.ToString();

        if (txtTitle != null)
            txtTitle.Text = ((LINQ.Book)e.Row.DataItem).Title.ToString();

        if (txtEdition != null)
            txtEdition.Text = ((LINQ.Book)e.Row.DataItem).Edition.ToString();

        if (imgSave != null)
            imgSave.CommandName = "Update";

        if (imgCancle != null)
            imgCancle.CommandName = "Cancel";
    }
}

protected void grdvBook_RowEditing(object sender, GridViewEditEventArgs e)
{
    grdvBook.EditIndex = e.NewEditIndex;
    grdvBook.Columns[5].HeaderText = "Update";
    grdvBook.Columns[6].Visible = false;
    imgAddBook.Visible = false;
    ShowTempBooks();
}

protected void grdvBook_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    grdvBook.EditIndex = -1;
    grdvBook.Columns[5].HeaderText = "Edit";
    grdvBook.Columns[6].Visible = true;
    if (Convert.ToInt32(((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtBookId")).Text) == 0)
    {
        List<LINQ.Book> objBooks = (List<LINQ.Book>)Session["Books"];
        objBooks.RemoveAt(objBooks.Count - 1);
        Session["Books"] = objBooks;
    }
    imgAddBook.Visible = true;
    ShowTempBooks();
}

protected void grdvBook_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    bool boolError = false;
    int bookId = Convert.ToInt32(((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtBookId")).Text);
    string author = ((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtAuthor")).Text;
    string ISBN = ((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtISBN")).Text;
    string year = ((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtYear")).Text;
    string title = ((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtTitle")).Text;
    string edition = ((TextBox)grdvBook.Rows[e.RowIndex].FindControl("txtEdition")).Text;
    if (author == string.Empty)
    {
        Utilities.CreateMessageLabel(this, BLL.Constants.AuthorNameReq, false);
        boolError = true;
    }
    if (ISBN == string.Empty)
    {
        Utilities.CreateMessageLabel(this, BLL.Constants.ISBNReq, false);
        boolError = true;
    }
    if (ISBN != string.Empty)
    {
        try
        {
            Convert.ToInt32(ISBN);
        }
        catch (FormatException ex)
        {
            Utilities.CreateMessageLabel(this, BLL.Constants.ISBNNumeric, false);
            boolError = true;
        }
    }
    if (year == string.Empty)
    {
        Utilities.CreateMessageLabel(this, BLL.Constants.YearReq, false);
        boolError = true;
    }
    if (year != string.Empty)
    {
        try
        {
            Convert.ToInt32(year);
        }
        catch (FormatException ex)
        {
            Utilities.CreateMessageLabel(this, BLL.Constants.YearNemeric, false);
            boolError = true;
        }
        if (year.Length > 4)
        {
            Utilities.CreateMessageLabel(this, BLL.Constants.YearLength, false);
            boolError = true;
        }
    }
    if (title == string.Empty)
    {
        Utilities.CreateMessageLabel(this, BLL.Constants.BookTitleReq, false);
        boolError = true;
    }
    if (edition == string.Empty)
    {
        Utilities.CreateMessageLabel(this, BLL.Constants.EditionReq, false);
        boolError = true;
    }
    if (!boolError)
    {
        List<LINQ.Book> objBooks = (List<LINQ.Book>)Session["Books"];
        LINQ.Book objBook = null;
        if (bookId > 0)
        {
            objBook = objBooks.Where(B => B.BookId == bookId).Single();
            objBook.CourseId = Convert.ToInt32(Session[Constants.ProgramSessionValues.courseId.ToString()]);
            objBook.Author = author;
            objBook.ISBN = ISBN;
            objBook.Title = title;
            objBook.Year = year;
            objBook.Edition = edition;
        }
        else
        {
            objBook = objBooks.ElementAt(e.RowIndex);
            objBook.CourseId = Convert.ToInt32(Session[Constants.ProgramSessionValues.courseId.ToString()]);
            objBook.Author = author;
            objBook.ISBN = ISBN;
            objBook.Title = title;
            objBook.Year = year;
            objBook.Edition = edition;
        }
        Session["Books"] = objBooks;
        grdvBook.EditIndex = -1;
        grdvBook.Columns[5].HeaderText = "Edit";
        grdvBook.Columns[6].Visible = true;
        imgAddBook.Visible = true;
        ShowTempBooks();
    }
    else
    {
        grdvBook.EditIndex = e.RowIndex;
    }
}

protected void grdvBook_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    List<LINQ.Book> objBooks = (List<LINQ.Book>)Session["Books"];

    objBooks.RemoveAt(e.RowIndex);
    Session["Books"] = objBooks;
    ShowTempBooks();
}

protected void imgAddBook_Click(object sender, ImageClickEventArgs e)
{
    GenerateBookRow();
}

public void GenerateBookRow()
{
    List<LINQ.Book> objBooks = (List<LINQ.Book>)Session["Books"];
    LINQ.Book objBook = new LINQ.Book();

    objBook.CourseId = Convert.ToInt32(Session[Constants.ProgramSessionValues.courseId.ToString()]);
    objBook.Author = string.Empty;
    objBook.ISBN = string.Empty;
    objBook.Year = string.Empty;
    objBook.Title = string.Empty;
    objBook.Edition = string.Empty;
    objBooks.Add(objBook);
    Session["Books"] = objBooks;
    grdvBook.EditIndex = objBooks.Count - 1;
    grdvBook.Columns[5].HeaderText = "Update";
    grdvBook.Columns[6].Visible = false;
    imgAddBook.Visible = false;
    ShowTempBooks();
}