DataGrid Width has no affect in Windows Mobile. C#

I a beginner in Windows Mobile development and found that when I set the Width using a DataGridTextBoxColumn it does not affect the DataGrid column size. Here is my code:

        DataGridTableStyle tableStyle = new DataGridTableStyle();
        tableStyle.MappingName = "MainStyle";

        DataGridTextBoxColumn tbcName = new DataGridTextBoxColumn();
        tbcName.Width = 120;
        tbcName.MappingName = "Name";
        tbcName.HeaderText = "Name";
        tableStyle.GridColumnStyles.Add(tbcName);

        DataGridTextBoxColumn tbcValue = new DataGridTextBoxColumn();
        tbcValue.Width = 200;
        tbcValue.MappingName = "Value";
        tbcValue.HeaderText = "Value";
        tableStyle.GridColumnStyles.Add(tbcValue);

        // dgUserAttributes is defined as a System.Windows.Forms.DataGrid
        dgUserAttributes.TableStyles.Clear();
        dgUserAttributes.TableStyles.Add(tableStyle);            

Any ideas?

Copyright Notice：Content Author:「Zzub」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/558026/datagrid-width-has-no-affect-in-windows-mobile-c-sharp