Did you add a DataGridTableStyle with teh proper mappingname to your
datagrid before you tried to use the columnstyles?

George Shepherd's Windows Forms FAQ contains an entry entitled:

How do I set the width of a column in my DataGrid?

Check it out at:
http://www.syncfusion.com/faq/winforms/search/792.asp

=============================================
Clay Burch, .NET MVP

Syncfusion, Inc.
visit http://www.syncfusion.com for .NET Essentials


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Hi!
I am trying to use a datagrid control on a smart device application. I
managed to see my data on it but i have to arrange the width of columns.
How can i do that?
I ve tried to use tablestyles but couldnt manage. I get System Null
Reference Exception...