WinForms Lookup - Display custom text if the lookup's value is not found in the drop-down list

This example handles the Properties.CustomDisplayText event to display custom text if the lookup's EditValue does not match any value in the drop-down list (the value does not exist in the data source).

const string NotFoundText = "???";

private void RepositoryItemLookUpEdit_CustomDisplayText(object sender, CustomDisplayTextEventArgs e) {
    RepositoryItemLookUpEdit props;
    if(sender is LookUpEdit)
        props = (sender as LookUpEdit).Properties;
    else
        props = sender as RepositoryItemLookUpEdit;
    
    if(props != null && (e.Value is int)) {
        object row = props.GetDataSourceRowByKeyValue(e.Value);
        if(row == null) {
            e.DisplayText = NotFoundText;
        }
    }
}

Files to Review

• Form1.cs (VB: Form1.vb)

Documentation

• Lookup Editors
• Lookup Main Settings
• Standard Binding (to Simple Data Types)

See Also

• DevExpress WinForms Troubleshooting - LookUp Editors
• How to Determine if a Value Put into the LookupEdit Does Not Exist in the Data Source
• How to Use the ProcessNewValue Event of a LookUp Editor

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