Retrieve GridView DataSource to Generate Reports

protected void btnGenrateReport_Click(object sender, EventArgs e)    {
        //for employee login         if (LoginType == 1)        {
            HTMLReport.TimeSheetPDFFormat(txtReportTitle.Text.Trim().ToString(), LoginEmployeeID, LoginEmployeeName);
        }                    else        { // for Admin login
            if (ddlReportEmployeewise.SelectedIndex!=0)            {
                HTMLReport.TimeSheetPDFFormat(txtReportTitle.Text.Trim().ToString(), Convert.ToInt32(ddlReportEmployeewise.SelectedValue),ddlReportEmployeewise.SelectedItem.ToString());
            }            else            {
                HTMLReport.TimeSheetPDFFormat(txtReportTitle.Text.Trim().ToString());
            }                   }}