Validate Dependent Fields with Custom Validators

• Validate related fields where values must be specified in one field or the other.


• Validate dependent fields where the value of one field is dependent on the value of another field.


• Perform page-level validation.

Add the code below in the AddOrdersPage class, located in:

.NET Framework 1.1:

...\<Application Folder>\Orders\AddOrdersPage.Controls.cs or .vb

.NET Framework 2.0:

...\<Application Folder>\App_Code\Orders\AddOrdersPage.Controls.cs .vb

C#:

public override void Validate() {     base.Validate ();     if (this.ShipPostalCode.Text.Equals("") || this.ShipCountry.Text.Equals(""))         throw new Exception("Ship Postal Code and Ship Country cannot be blank"); }

Visual Basic .NET:

Public Overrides Sub Validate()      MyBase.Validate      If (Me.ShipPostalCode.Text.Equals("") OrElse Me.ShipCountry.Text.Equals("") Then           Throw New Exception("Ship Postal Code and Ship Country cannot be blank")      End If End Sub

How to validate (using a custom validator) a field according to an option selected in a list box:

http://searchvb.techtarget.com/vsnetATEAnswers/0,293820,sid8_gci912327_tax293672,00.html

The above example also shows how to do validation in JavaScript. You can place the JavaScript in the HTML layout page and it will be passed unmodified to the ASPX page generated by Iron Speed Designer.

The following example shows how to create a custom RequiredIfValidator. This might be helpful if you are doing this often.

https://secure.codeproject.com/cs/miscctrl/RequiredIfValidator.asp

The following example shows how to use the RequiredFieldValidator with other validation controls to handle blank entries.

http://support.microsoft.com/default.aspx?scid=kb;en-us;313044

Anh is a software engineer at Iron Speed, Inc. He enjoys developing applications with Iron Speed Designer and Microsoft .NET technology.