Dynamically add Header Row in GridView at runtime in ASP.Net

Hi celv,

I have created one sample that full-fill your requirement.

HTML

<asp:GridView runat="server" ID="gvDetails" AutoGenerateColumns="false" OnRowCreated="gvDetails_RowCreated">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Mobile" HeaderText="Mobile" />
    </Columns>
</asp:GridView>

 Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                    new DataColumn("Name", typeof(string)),
                    new DataColumn("Mobile",typeof(Int64)) });
        dt.Rows.Add(1, "celv", 1111111111);
        dt.Rows.Add(2, "ram", 2222222222);
        dt.Rows.Add(2, "hari", 3333333333);
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
}

protected void gvDetails_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Header)
    {
        GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Insert);
        TableCell th = new TableHeaderCell();
        th.ForeColor = Color.White;
        th.BackColor = Color.SteelBlue;
        th.Text = "Details of Employee";
        th.ColumnSpan = gvDetails.Columns.Count;
        row.Cells.Add(th);
        gvDetails.Controls[0].Controls.AddAt(0, row);
    }
}

Screenshot