Question

Dim Permission As String
        Dim chk As String = "p"
        Permission = (ds.Tables("privilege").Rows(0).Item(0)).ToString
        MessageBox.Show(Permission)
        Dim PermissionArray() As String = Split(Permission, ":")
        For i As Integer = 0 To 36
            If PermissionArray(i) = 1 Then
                Try
                    Dim chkBox As CheckBox = CType(Me.Controls(chk & i), CheckBox)
                    chkBox.Checked = True
                Catch ex As Exception
                    MessageBox.Show(ex.ToString)
                End Try
            End If
        Next

This code gives me the following error in catch, i have googled but nothing is working

This is the error: System.NullReferenceException – Object reference not set to an instance of an object.

Answer 1

As you noted chkBox.Checked throws NullReferenceException, you should evaluate the following line for the error:

Dim chkBox As CheckBox = CType(Me.Controls(chk & i), CheckBox)

' This may throw NullReferenceException if there is no (chk & i) control available
chkBox.Checked = True