How to: Implement a Custom Validation Procedure
The following example shows how to handle the BaseEdit.Validate event to provide a custom validation procedure.
The image below shows the result:
private void dxTextEdit_Validate(object sender, DevExpress.Xpf.Editors.ValidationEventArgs e) {
if (e.Value == null) return;
if (e.Value.ToString().Length > 4) return;
e.IsValid = false;
e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Information;
e.ErrorContent = "User ID is less than five symbols. Please correct.";
}