Thank you for writing.
Setting the AutoSizeColumnsMode to Fill
will take the current grid width, divide it on the number of the columns and the result will be assigned as width for each column. To have your columns size according to their content, you need to use the BestFitColumns
More information about the sizing features of RadGridView is available here: http://www.telerik.com/help/winforms/gridview-columns-resizing-columns-programatically.html
I hope this helps.
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