Create header dynamically in gridview using ASP.NET

Create header dynamically in gridview using ASP.NET if you are using this code means,while binding time,we have to set the property showheader="false" .

protected void GridViewExcel_RowCreated(object sender, GridViewRowEventArgs e)
{
GridView gv = (GridView)sender;
if (e.Row.RowType == DataControlRowType.Header)
{
if (gv.HasControls())
{
GridViewRow tr1 = new GridViewRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
TableHeaderCell tcCheckBox = new TableHeaderCell();
CheckBox chkCheckAll = new CheckBox();
chkCheckAll.ID = "chkCheckAll";
chkCheckAll.Attributes.Add("onclick", "return select_deselectAll(this.checked, this.id)");
chkCheckAll.ToolTip = "select/deselect all";
tcCheckBox.RowSpan = 2;
tcCheckBox.Controls.Add(chkCheckAll);
tcCheckBox.CssClass = "HeadwithBG";
tr1.Cells.Add(tcCheckBox);
TableHeaderCell tcSNo = new TableHeaderCell();
tcSNo.Text = "SNO";
tcSNo.RowSpan = 2;
tcSNo.CssClass = "HeadwithBG";
tr1.Cells.Add(tcSNo);
TableHeaderCell tcUSN = new TableHeaderCell();
tcUSN.Text = "USN";
tcUSN.CssClass = "HeadwithBG";
tcUSN.RowSpan = 2;
tr1.Cells.Add(tcUSN);
TableHeaderCell tcName = new TableHeaderCell();
tcName.Text = "Name";
tcName.Width = 800;
tcName.CssClass = "HeadwithBG";
tcName.RowSpan = 2;
tr1.Cells.Add(tcName);
TableHeaderCell tcSubCode = new TableHeaderCell();
tcSubCode.Text = "Sub code";
tcSubCode.CssClass = "HeadwithBG";
tr1.Cells.Add(tcSubCode);
ArrayList ArrSubcode = new ArrayList();
ArrayList ArrMaxDetail = new ArrayList();
if (Session["SubCode"] != null)
{
ArrSubcode = (ArrayList)Session["SubCode"];
}
if (Session["MaxDetail"] != null)
{
ArrMaxDetail = (ArrayList)Session["MaxDetail"];
}
for (int i = 0; i < ArrSubcode.Count; i++)
{
TableHeaderCell tcSub = new TableHeaderCell();
tcSub.Text = ArrSubcode[i].ToString();
tcSub.CssClass = "HeadwithBG";
string strTest = string.Empty;
strTest = ArrSubcode[i].ToString();
if (!string.IsNullOrEmpty(strTest))
{
// tcSub.ColumnSpan = 2;
tr1.Cells.Add(tcSub);
}
}
((Table)gv.Controls[0]).Rows.AddAt(0, tr1);
GridViewRow tr2 = new GridViewRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
string strType = string.Empty;
if (Session["FileType"] != null)
{
strType = Session["FileType"].ToString();
if (strType.Contains("Attendance"))
{
strType = "Max Attendance";
}
else if (strType.Contains("MarkSheet"))
{
strType = "Max Marks";
}
}
TableHeaderCell tcMaxMarks = new TableHeaderCell();
tcMaxMarks.Text = strType;
tcMaxMarks.CssClass = "HeadwithBG";
tr2.Cells.Add(tcMaxMarks);
for (int i = 0; i < ArrMaxDetail.Count; i++)
{
TableHeaderCell tcAtten = new TableHeaderCell();
tcAtten.Text = ArrMaxDetail[i].ToString();
tcAtten.CssClass = "HeadwithBG";
string strTest = string.Empty;
strTest = ArrMaxDetail[i].ToString();
if (!string.IsNullOrEmpty(strTest))
{
tr2.Cells.Add(tcAtten);
}
}
((Table)gv.Controls[0]).Rows.AddAt(1, tr2);
}
}
}