C errorprovider validating

c errorprovider validating-73
In the following tutorial we will demonstrate how to use a validation panel together with Error provider. For the purpose of this tutorial, we will create a new class Employee with a couple of exposed properties. Data Layout Item Validated Event Args) Dim employee As Employee = Try Cast(Me.

In the following tutorial we will demonstrate how to use a validation panel together with Error provider. For the purpose of this tutorial, we will create a new class Employee with a couple of exposed properties. Data Layout Item Validated Event Args) Dim employee As Employee = Try Cast(Me.

It is a component rather than a control, so when you put it on your form it will sit in the component tray below.

What this component can do is display a little red icon beside any control which is invalid. Now, in the Validating event of the textbox you need to put the code to test the contents for validity and optionally display the error icon.

Set Error(Try Cast(sender, Control), "Last Name should be between 2 and 15 chars long.") If Not Me.

Contains Key("Last Name") Then Dim label As New Rad Label() label. Text = "Last Name should be between 2 and 15 chars long." label.

Set Error(Try Cast(sender, Control), "Salary should be in range 1500 - 1700.") If Not Me.

Contains Key("Salary") Then Dim label As New Rad Label() label. Text = "Salary should be in range 1500 - 1700." label.

So what we need is a method of unobtrusively showing that data is invalid, and presenting it in such a way that it is immediately obvious what is wrong and what to do about it.

This little Gem is often left unnoticed, which is a funny thing considering it sits in the Windows Forms Controls Toolbox by default.

When a user is tabbing fast through a dialog entering data, they are sometimes going to get it wrong. When we do get it wrong, however, we don't want to be bugged about it.

The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong.

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