How I Show MessegeBox in ClassFile in C#.net

[C# Programming]

Hi,

I Add New Class in My Solution For Use Some Functions in Other Forms.

If i Use this Code

public static void *******UserList()
{

dtTableUserList = new DataTable();

try
{
dtTableUserList.Rows.Clear();
string cmd = "select * from tblLogin order by UserName";
da = new OleDbDataAdapter(cmd, con);
con.Open();
da.Fill(dtTableUserList);
con.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

}


here ERROR is in
MessageBox.Show(ex.Message);

How i show messegebox in class

Thanks & Regards

Form :-
Vikash Yadav
Mob : 9210907172