This post shows you How to configure TextEdit to accept only numbers using DevExpress Component.

If you want to set the TextEdit control only accept numeric you can use the MaskType property set to numeric.

textEdit1.Properties.Mask.MaskType = DevExpress.XtraEditors.Mask.MaskType.Numeric;
textEdit1.Properties.Mask.EditMask = "n0";
textEdit1.Properties.Mask.UseMaskAsDisplayFormat = true;

For example: 1,000

If you want to edit decimal you can set EditMask

textEdit1.Properties.Mask.EditMask = "n2";

For example: 10.05