hi you can do it like this
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="grvMergeHeader" runat="server"
BackColor="LightGoldenrodYellow"
BorderColor="Tan" BorderWidth="5px"
CellPadding="3" ForeColor="Black"
GridLines="None" BorderStyle="None" CellSpacing="2"
AutoGenerateColumns="False"
DataSourceID="SqlDataSource1"
OnRowCreated="grvMergeHeader_RowCreated">
<FooterStyle BackColor="Tan" />
<SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />
<PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue"
HorizontalAlign="Center" />
<HeaderStyle BackColor="Tan" Font-Bold="True" />
<AlternatingRowStyle BackColor="PaleGoldenrod" />
<Columns>
<asp:BoundField DataField="DepartMentID"
HeaderText="DepartMentID"
SortExpression="DepartMentID" />
<asp:BoundField DataField="DepartMent"
HeaderText="DepartMent"
SortExpression="DepartMent" />
<asp:BoundField DataField="Name"
HeaderText="Name"
SortExpression="Name" />
<asp:BoundField DataField="Location"
HeaderText="Location"
SortExpression="Location" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [DepartMentID], [DepartMent], [Name], [Location] FROM [Employee]">
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
Code behind
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);
}
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