What is a RequiredFieldValidator control?

The RequiredFieldValidator is a control that checks whether the value of an assigned input control is different from its initial value.

To work with this control drag a RequiredFieldValidator control, Command Button and two TextBoxes from the Toolbox. The intention is to display the text entered in TextBox1 in TextBox2 when the Command Button is clicked. If there is no value in TextBox1, an error message ("Saying Textbox1 needs a value") will be spawned.

All you have to make the RequiredFieldValidator work is to open the properties of the control. Looking at two properties; ErrorMessage and ControltoValidate specifically. The ErrorMessage property should be completed with a warning that the field needs to be completed. Secondly, the ControltoValidate property is used to tag which control is to be validated.

The sample code for that is:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal_
                                    e As System.EventArgs) Handles Button1.Click
TextBox2.Text = TextBox1.Text
End Sub

Written by Sandeep Mogulla, Webmaster at www.startvbdotnet.com

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