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Editorial Team
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Asked: 2026-05-27T13:39:10+00:00

I have a text box like below : <asp:TextBox ID=headertxtUserName runat=server Text=User Name onfocus=onfocusOfUserName(this);

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I have a text box like below : 

<asp:TextBox ID="headertxtUserName" runat="server" Text="User Name" onfocus="onfocusOfUserName(this);" 
    onblur="onblurOfUserName(this);" CssClass="header-login-input" ValidationGroup="A" Font-Names="Tahoma">
</asp:TextBox>

as you see there is a default text = “User Name” in that text box.
which validator should i use for this text box for purpose below :

when Text=”User Name” or Text=”” returns false.
when Text!=”User
Name” or Text!=”” returns true.

I know we can use CustomValidators!
but i don’t want any postback, so what can I do?

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1 Answer

  1. Editorial Team

    You can use a RegularExpressionValidator in combination with a RequiredFieldValidator control for this. It will validate the value of the textbox on the client, without a postback.

    My syntax below may be slightly off. I’m not near a PC with Visual Studio, so I’m doing this off the top of my head. Please forgive me if I spelled something wrong.

    <asp:TextBox id="UserNameTextBox" runat="server" Text="User Name" /> 
<asp:RegularExpressionValidator id="UserNameTextBoxRegexValidator" runat="Server" ControlToValidate="UserNameTextBox" ValidationExpression="^User Name$" ErrorMessage="please enter a user name" />
<asp:RequiredFieldValidator id="UserNameTextBoxRequiredFieldValidator" runat="server" ControlToValidate="UserNameTextBox" ErrorMessage="please enter a user name" />
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