#CSLA ERRORPROVIDER HOW TO#
#CSLA ERRORPROVIDER CODE#
#CSLA ERRORPROVIDER WINDOWS#

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#CSLA ERRORPROVIDER CODE#

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#CSLA ERRORPROVIDER WINDOWS#

Xml database in Windows Forms application using Visual Studio 2010 in VB.NET.TabControl in a Windows Forms application in Visual Studio 2010 in VB.NET.Setup for a Windows Forms application using Visual Studio 2010 in VB.NET.The key method of the ErrorProvider component is the SetError method, which specifies the error message string and where the error icon should appear. When the DataSourceproperty is set, the ErrorProvider component can display error messages for a dataset. The Icon property can be set to a custom error icon instead of the default. When the component is added in the designer, the ContainerControl property is set to the containing form if you add the control in code, you must set it yourself. The ContainerControl property must be set to the appropriate container (usually the Windows Form) in order for the ErrorProvider component to display an error icon on the form. The ErrorProvider component's key properties are DataSource, ContainerControl, and Icon. The ErrorProvider component displays an error icon ( ) next to the relevant control, such as a text box when the user positions the mouse pointer over the error icon, a ToolTip appears, showing the error message string. An error provider is a better alternative than displaying an error message in a message box, because once a message box is dismissed, the error message is no longer visible. It is typically used in conjunction with validating user input on a form, or displaying errors within a dataset. If (!string.IsNullOrEmpty(ReadProperty(target, Example.A).ToString()) & !String.IsNullOrEmpty(ReadProperty(target, Example.B).ToString()))Ĭontext.The Windows Forms ErrorProvider component is used to validate user input on a form or control. Protected override void Execute(RuleContext context)Įxample target = (Example)context.Target Protected override ValidationResult IsValid(object value, ValidationContext validationContext) c# Ĭlass CustomAttribute : ValidationAttribute I look like the way I'm not invoking the validation correctly. Please note the second I try to modify Property B the error provider disappears. When blanking property A, the error provider goes away from txtBoxA and stays around txtBoxB even though I triggered the validation of property B after property A is set. When Property A has a value and property gets updated, the error provider appears around the two boxes, which is perfectly fine. The problem is that error provider is not updating.

To solve this issue I called the Validator.ValidateProperty in the property setter to validate property A when B is set and vise versa. Upon Blanking property B, property A should become valid and vise versa. If Property A is set to something and property B already has a value, then property A and B becomes invalid.

The requirements is to have at least one property null. I have a CSLA object with two managed properties and a custom Attribute.

Csla errorprovider