For Each t As Table In Tables
    t.Visible = True
    t.AllowEdit = True
    For Each c As Col In t.Cols
        c.Visible = True
        c.AllowEdit = True
    Next
Next
Dim ug As String = e.Form.Controls("用户角色").Value
Dim cmd As New SQLCommand
cmd.C
If User.Type = UserTypeEnum.User Then
    For Each dr As DataRow In DataTables("授权").Select("分组名 = \'" & ug & "\'")
        If dr.IsNull("列名") Then
            Tables(dr("表名")).Visible = Not dr("不可见")
            Tables(dr("表名")).AllowEdit = Not dr("不可编辑")
        Else
            Tables(dr("表名")).Cols(dr("列名")).Visible = Not dr("不可见")
            Tables(dr("表名")).Cols(dr("列名")).AllowEdit = Not dr("不可编辑")
        End If
    Next
End If

这里的Dim ug As String = e.Form.Controls("用户角色").Value,,要怎么声明的，，