Hi akhter,

You need to check the GridView row count. If it has row then apply the header code.

Refer below code.

protected void GridView1_DataBound(object sender, EventArgs e)
{
    if (GridView1.Rows.Count > 0)
    {
        GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);
        TableHeaderCell cell = new TableHeaderCell();
        cell.Text = "Action";
        cell.ColumnSpan = 1;
        cell.Attributes.Add("style", "text-align:center !important;");
        row.Controls.Add(cell);

        cell = new TableHeaderCell();
        cell.ColumnSpan = 5;
        cell.Text = "Shipper Info";
        cell.Attributes.Add("style", "text-align:center !important;");
        row.Controls.Add(cell);

        cell = new TableHeaderCell();
        cell.ColumnSpan = 6;
        cell.Text = "Invoice Info";
        cell.Attributes.Add("style", "text-align:center !important;");
        row.Controls.Add(cell);

        cell = new TableHeaderCell();
        cell.ColumnSpan = 5;
        cell.Text = "Forwarder Info";
        cell.Attributes.Add("style", "text-align:center !important;");
        row.Controls.Add(cell);

        row.BackColor = System.Drawing.ColorTranslator.FromHtml("#3AC0F2");
        row.Height = 50;

        GridView1.HeaderRow.Parent.Controls.AddAt(0, row);
    }
}