ValidationTrigger Property (ValidationSettings)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using Infragistics.Win;
using Infragistics.Win.Misc;
using System.Drawing;
using System.Drawing.Drawing2D;

    private void MakeValueRequired( UltraValidator ultraValidator, List<TextBox> textFields )
    {
        //  Clear the ValidationGroups collection of any existing members,
        //  and add one that will be assigned to the ValidationSettings for
        //  the specified controls.
        ultraValidator.ValidationGroups.Clear();
        ValidationGroup requiredFieldsGroup = ultraValidator.ValidationGroups.Add( "Required" );

        //  Create the ValidationSettings for each control
        int count = textFields != null ? textFields.Count : 0;
        for ( int i = 0; i < count; i ++ )
        {
            TextBox textBox = textFields[i];
            ValidationSettings validationSettings = ultraValidator.GetValidationSettings( textBox );
            validationSettings.Reset();

            //  Assign the same group to each one
            validationSettings.ValidationGroup = requiredFieldsGroup;

            //  Do not trigger validation on user interaction, only when the
            //  Validate method is called.
            validationSettings.ValidationTrigger = ValidationTrigger.Programmatic;

            //  Use the value of the 'Text' property to provide the validation value
            validationSettings.ValidationPropertyName = "Text";

            //  Set IsRequired to true
            validationSettings.IsRequired = true;
        }

        //  Handle the UltraValidator's ValidationError event
        ultraValidator.ValidationError += new ValidationErrorHandler( this.OnRequiredFieldValidationError );
    }

    private void ValidateRequired( ValidationGroup requiredFieldsGroup )
    {
        //  Get a reference to the UltraValidator component.
        UltraValidator ultraValidator = requiredFieldsGroup.UltraValidator;

        //  Call the Validate method to programmatically validate all controls
        //  that belong to the 'required fields' group. Allow the error images
        //  to be shown, but not the MessageBox.
        ultraValidator.Validate( requiredFieldsGroup, true, false );
    }

    //  Handles the UltraValidator's ValidationError event for required field validations.
    private void OnRequiredFieldValidationError( object sender, ValidationErrorEventArgs e )
    {
        StringBuilder sb = new StringBuilder();
        sb.Append( "The following required fields are currently empty:" );
        sb.Append( Environment.NewLine );
        sb.Append( Environment.NewLine );

        ValidationResultsCollection errors = e.Validation.Errors;
        for ( int i = 0; i < errors.Count; i ++ )
        {
            ValidationResult result = errors[i];
            sb.Append ( string.Format("{0}{1}", result.ValidationSettings.Control.Name, Environment.NewLine) );
        }

        UltraValidator ultraValidator = sender as UltraValidator;
        MessageBox.Show( sb.ToString(), "Validation Error", MessageBoxButtons.OK, ultraValidator.MessageBoxIcon );
    }