ASP.NET

   private DataTable saveGridToDataTable()
       {
           DataTable tbl = AppData.getEmptyOQTraineesTable();
           int testScore = 0;

           foreach (GridViewRow row in this.gvResults.Rows)
           {
               if (row.Visible)
               {
                   DataRow r = tbl.NewRow();
                   DateTime dValue = DateTime.Today;
                   TextBox txtTestDate = (TextBox)row.FindControl("txtTestDate");
                   TextBox txtQaulificationDate = (TextBox)row.FindControl("txtQualificationDate");
                   TextBox txtScore = (TextBox)row.FindControl("txtScore");
                   TextBox txtEmpNumber = (TextBox)row.FindControl("txtEmpNumber");

                   if (string.IsNullOrEmpty(txtEmpNumber.Text))
                       r["Employee"] = DBNull.Value;
                   else
                       r["Employee"] = txtEmpNumber.Text;


                   if (int.TryParse(txtScore.Text, out testScore))
                       r["TestScore"] = testScore;

                   if (DateTime.TryParse(txtTestDate.Text, out dValue))
                       r["TaskDate"] = dValue;

                   if (DateTime.TryParse(txtQaulificationDate.Text, out dValue))
                       r["QualificationDate"] = dValue;

                   tbl.Rows.Add(r);
               }
           }
           return tbl;
       }



public static DataTable getEmptyOQTraineesTable()
       {
           string x = string.Empty;
           DateTime y = DateTime.Today;
           Int32 z = 0;

           DataColumn dc1 = new DataColumn();
           dc1.DataType = x.GetType();
           dc1.ColumnName = "Employee";

           DataColumn dc3 = new DataColumn();
           dc3.DataType = y.GetType();
           dc3.ColumnName = "TaskDate";


           DataColumn dc4 = new DataColumn();
           dc4.DataType = z.GetType();
           dc4.ColumnName = "TestScore";

           DataColumn dc5 = new DataColumn();
           dc5.DataType = y.GetType();
           dc5.ColumnName = "QualificationDate";

           DataTable dt = new DataTable();
           dt.Columns.AddRange(new DataColumn[4] { dc1, dc3, dc4, dc5 });
           return dt;
       }

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
    Response.Write("Init " & Session.SessionID)
End Sub

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not Page.IsPostBack Then Session("X") = "X"
End Sub