Merge Merging GridView Header Columns Multiple Headers ASP.NET

In this example i m explaining how to Merging Or Merge GridView Header Columns Or Combine Multiple Headers using C# VB.NET In ASP.NET 2.0,3.5,4.0.

For this you need to create GridView header row in RowCreated Event

<asp:GridView ID="grvMergeHeader" runat="server" 

              AutoGenerateColumns="False" 

              DataSourceID="SqlDataSource1" 

              OnRowCreated="grvMergeHeader_RowCreated">

<Columns>

<asp:BoundField DataField="DepartMentID" HeaderText="DepartMentID"/>

<asp:BoundField DataField="DepartMent" HeaderText="DepartMent"/>

<asp:BoundField DataField="Name" HeaderText="Name"/>

<asp:BoundField DataField="Location" HeaderText="Location"/>

</Columns>

</asp:GridView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 

ConnectionString="<%$ ConnectionStrings:ConnectionString %>"

SelectCommand="SELECT [DepartMentID], [DepartMent], [Name], 

              [Location] FROM [Employee]">

</asp:SqlDataSource>

Now In Code behind, in RowCreated Event of grid view i m creating a new gridview row of header type and than in this row i m adding 2 cells

C# CODE

---

protected void grvMergeHeader_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            GridView HeaderGrid = (GridView)sender;
            GridViewRow HeaderGridRow = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
            TableCell HeaderCell = new TableCell();
            HeaderCell.Text = "Department";
            HeaderCell.ColumnSpan = 2;
            HeaderGridRow.Cells.Add(HeaderCell);

            HeaderCell = new TableCell();
            HeaderCell.Text = "Employee";
            HeaderCell.ColumnSpan = 2;
            HeaderGridRow.Cells.Add(HeaderCell);

            grvMergeHeader.Controls[0].Controls.AddAt(0, HeaderGridRow);

        }
    }

VB.NET

---

Protected Sub grvMergeHeader_RowCreated(sender As Object, e As GridViewRowEventArgs)
 If e.Row.RowType = DataControlRowType.Header Then
  Dim HeaderGrid As GridView = DirectCast(sender, GridView)
  Dim HeaderGridRow As New GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert)
  Dim HeaderCell As New TableCell()
  HeaderCell.Text = "Department"
  HeaderCell.ColumnSpan = 2
  HeaderGridRow.Cells.Add(HeaderCell)

  HeaderCell = New TableCell()
  HeaderCell.Text = "Employee"
  HeaderCell.ColumnSpan = 2
  HeaderGridRow.Cells.Add(HeaderCell)


  grvMergeHeader.Controls(0).Controls.AddAt(0, HeaderGridRow)
 End If
End Sub

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