Unhandled exception error

[Spiel79]

Hello everyone. I have a form which is supposed to refresh everytime a button on another form is clicked. Part of the code for the refresh form looks like this:

Dim testtblstyle As New DataGridTableStyle()
       testtblstyle.MappingName = "testfield"
       Dim testcolstyles As GridColumnStylesCollection
       testcolstyles = testtblstyle.GridColumnStyles
       testcolstyles.Add(testcolumn1)
       testcolstyles.Add(testcolumn2)
       testcolstyles.Add(testcolumn3)
       DataGrid1.TableStyles.Add(testtblstyle)

 

However, when executed and when the button is clicked i get this error message:

An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll

 

Additional information: The data grid table styles collection already contains a table style with the same mapping name.

 

Please let me know how to overcome this problem. Thanks.

[GetYourAnswers]

Hi Spiel79,

 

Can you tell me at which line number are you getting this exception.

 

GetYourAnswers

[Spiel79]

Realised what the problem was.

Was declaring the add tablestyles command within the function so it was executing everytime the function was called, hence the error.

Managed to overcome it by declaring it in the form load event.