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ASP.Net RequiredFieldValidator Control

The RequiredFieldValidator: The RequiredFieldValidator control ensures that the required field is not empty. It is generally tied to a text box to force input into the text box.

RequiredFieldValidator additional properties (Check here for other default properties and sample):

Property
Description
InitialValue
Specifies the starting value of the input control. Default value is ""

Some points about RequiredFieldValidator:
·         The RequiredFieldValidator control is used to make an input control a required field.
·         With this control, the validation fails if the input value does not change from its initial value. By default, the initial value is an empty string ("").
·         The InitialValue property does not set the default value for the input control. It indicates the value that you do not want the user to enter in the input control.
·         Use the ‘InitialValue’ property of the RequiredFieldValidator to validate controls like combobox which have a default value. For e.g.: If your combobox has a default item called “Select“ and you want that the user should select a value other than the default value before submitting the form, then set the ‘InitialValue’ property of the RequiredFieldValidator to “Select “.
·         Leading and trailing spaces of the input value are removed before validation.

  Control usage:

<asp:TextBox runat="server" ID="txtName"></asp:TextBox>

To validate this textbox:
<asp:RequiredFieldValidator ID="rfvName" runat="server"
    ControlToValidate="txtName" ErrorMessage="*Required">
</asp:RequiredFieldValidator>

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