ASP.NET

 static DataTable dtvalues = new DataTable();
       public static IICDServices icdObj;
    protected void Page_Load(object sender, EventArgs e)
    {
               if (!IsPostBack)
        {
                       
        }

    }

    private void Createdatatable()
    {
        dtvalues.Columns.Add("DL_No");
        dtvalues.Columns.Add("F_Name");
        dtvalues.Columns.Add("M_Name");
        dtvalues.Columns.Add("L_Name");
        dtvalues.Columns.Add("Unit");
        dtvalues.Columns.Add("Birth_Date");
        dtvalues.Columns.Add("Mobile_No");
        
    }
//on the add button click i want all data from the textboxes to be assigned to the datatable.
for which i have written the following code

 {

                        DataRow drvalues = dtvalues.NewRow();
                        drvalues["DL_No"] = TxtDLNO.Text.ToUpper();
                        drvalues["F_Name"] = txtFname.Text;
                        drvalues["M_Name"] = txtMName.Text;
                        drvalues["L_Name"] = txtLName.Text;
                        drvalues["Unit"] = ddlUnit.SelectedItem.Text;
                        drvalues["Birth_Date"] = Gmdatepicker3.Date;
                        drvalues["Mobile_No"] = TxtMobileNo.Text;
                        dtvalues.Rows.Add(drvalues);
                        GridView1.DataSource = dtvalues;
                        GridView1.DataBind();
                        TxtDLNO.Text = "";
                        txtFname.Text = "";
                        txtMName.Text = "";
                        txtLName.Text = "";
                        TxtMobileNo.Text = "";
                    }
on the submit button click i want to redirect this page back to itself but it throws an exception as the page has npt been rebuilt.
please help me out with this.
     thanks.