[Solved] how to open a message box [closed]

Question

By message box I’m assuming you mean a javascript alert. I’m not a big fan of posting back with javascript functions. I think its messy, and that javascript should only be used when dealing with client-side actions.

I would actually recommend to use a placeholder and a literal control for this. You could have the following in your webform:

<asp:placeholder id="phLoginFailed" runat="server" visible="false">
     <div class="loginfailed">
        Login failed
     </div>
</asp:placeholder>

This placeholder could be styled like a popup, or displayed within your page using CSS.

Then change your C# to:

else
{
    phLoginFailed.Visible = true;
}

Also, its worth mentioning, your SQL query is prone to SQL Injection. You should use parameterised queries.

And you should encrypt passwords when storing them in the database for security purposes.

Accepted Answer