CODEWITHSUNDEEP
c#asp.net
Able
Able

Reputation: 3912

How to show an error message dialogs in Asp.net

How to show an error messages or data validation messages in Asp.net with c# language. Please guide me.

Upvotes: 1

Views: 5123

Answers (3)

FishBasketGordo
FishBasketGordo

Reputation: 23142

There are lots of ways to accomplish this, depending your particular situation, but you might try using one of the ASP.NET validation controls, like RequiredFieldValidator or RegularExpressionValidator.

Example

<asp:TextBox id="textbox1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="reqFldValidator" 
                            runat="server" 
                            ControlToValidate="textbox1" 
                            ErrorMessage="Field is required!" />
<asp:RegularExpressionValidator ID="regExValidator" 
                            runat="server" 
                            ControlToValidate="textbox1" 
                            ValidationExpression="\d+" 
                            ErrorMessage="Must be a number!"/>

The preceding ASP.NET markup is all you need to perform a couple of basic validations on a TextBox. If the the form is submitted and the TextBox is blank, the RequiredFieldValidator will preempt the postback and show the message "Field is required!". Similarly, if the text in the TextBox does not match the ValidationExpression of the RegularExpressionValidator, the message "Must be a number!" will be shown.

You can do a lot more with the ASP.NET validation controls, but this is just a basic example. To learn more, consult the MSDN documentation.

Upvotes: 0

Jaime
Jaime

Reputation: 172

Use te validation summary along with the asp.net validators. Check this msdn documentation.At the end of the webpage you'll find a nice and easy example how how to use validation summaries. Happy coding

Upvotes: 0

Alex Aza
Alex Aza

Reputation: 78487

Markup:

<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

Code-behind:

protected void Button1_Click(object sender, EventArgs e)
{
    ClientScript.RegisterStartupScript(
        this.GetType(), "myalert", "alert('" + errorText + "');", true);
}

or

 Response.Write(
     @"<SCRIPT LANGUAGE=""JavaScript"">alert('" + errorText + "')</SCRIPT>");

Upvotes: 1

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