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How to change the textbox background color when the Regular expression shows an error?

Posted on 2009-04-12
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Last Modified: 2013-11-26
Instead of using the error message "Error" I would like to change the textbox txtzipcode  background red using CSS can this be done.

<form id="form1" runat="server">
    <div>
   
        <asp:TextBox ID="txtzipcode" runat="server"></asp:TextBox>
        <asp:RegularExpressionValidator ID="ValZipcode" runat="server"
            BorderStyle="None" ControlToValidate="txtzipcode"
            ErrorMessage="Error"
           
           
            ValidationExpression="^((\d{5}-\d{4})|(\d{5})|([AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]\d[A-Za-z]\s?\d[A-Za-z]\d))$"
            ForeColor="#FF3300"></asp:RegularExpressionValidator>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" />
   
    </div>
    </form>
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Question by:WDJ98338
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numberkruncher earned 500 total points
ID: 24127337
I don't think that you can do that with the regular expression validator control; however it is very easy to add this functionality to your button click handler.
protected void Button1_Click(object sender, EventArgs e)
{
    string pattern = @"^((\d{5}-\d{4})|(\d{5})|([AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]\d[A-Za-z]\s?\d[A-Za-z]\d))$";
 
    if (!Regex.IsMatch(txtzipcode.Text, pattern, RegexOptions.Compiled))
    {
        txtzipcode.BackColor = Color.Red;
    }
}

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