DevExpress controls are rich and complex, and there are several ways to do this.
The simplest, perhaps, is to set the display format of the columns as follows:
gridColumn.DisplayFormat.FormatString = "N2"; gridColumn.DisplayFormat.FormatType = DevExpress.Utils.FormatType.Custom;
FormatString can be any of the standard strings of a standard or custom .NET format (see MSDN or Google for "Standard number format strings", "Custom number format strings").
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