I am having a problem with a DataTable object reference. I get the error message "System.NullReferenceException: Object reference not set to an instance of an object." on line 51. The Function1 works fine, the problem in only in Function2. Can anyone help the rookie out?

1 namespace Test
2 {
3 public class TestClass : System.Web.UI.Page
4 {
5 public DataSet MyDataSet;
6 public DataTable MyDataTable1;
7 public DataTable MyDataTable2;
8
9
10 public void Function1()
11 {
12 MyDataSet = new DataSet();
13 MyDataTable1 = MyDataSet.Tables.Add("DataTable1");
14
15 MyDataTable1.Columns.Add("Col1", typeof(Decimal));
16 MyDataTable1.Columns.Add("Col2", typeof(String));
17
18 MyDataTable2 = MyDataSet.Tables.Add("DataTable2");
19
20 MyDataTable2.Columns.Add("Col1", typeof(Decimal));
21 MyDataTable2.Columns.Add("Col1", typeof(String));
22
23 string CMDStr = "SQL Statement";
24
25 SQLConn = new SqlConnection("Connection String");
26
27 SqlCommand SQLCmd = new SqlCommand(CMDStr, SQLConn);
28
29 SQLConn.Open();
30
31 SqlDataReader SQLReader = SQLCmd.ExecuteReader();
32
33 DataRow MyRow1;
34
35 while (SQLReader.Read())
36 {
37 MyRow1 = dtAvailableElements.NewRow();
38 MyRow1["Col1"] = SQLReader.GetValue(0);
39 MyRow1["Col2"] = SQLReader.GetString(1);
40 dtAvailableElements.Rows.Add(MyRow1);
41 }
42
43 SQLReader.Close();
44 SQLConn.Close();
45 }
46
47 public void Function2()
48 {
49 DataRow MyRow2;
50
51 MyRow2 = MyDataTable2.NewRow();
52 MyRow2["ElementCode"] = 45;
53 MyRow2["ElementName"] = txtFieldName.Text;
54 MyDataTable2.Rows.Add(MyRow2);
55 }
56 }
57 }