Can't activate message box with SQL data - ASP.NET

Question

I am testing my knowledge of ADO.NET and SQL and am currently just trying to do the basics. I want to read from a table and when the user clicks a button, a message box pops up with the value in the ApplicationName column.

It currently doesn't do anything when I click the button... any ideas?

protected void TestSubmit_ServerClick(object sender, EventArgs e)
    {
        // Initialize the database connector.
        SqlConnection connectSQL = new SqlConnection();

        // Send the connection string.
        connectSQL.ConnectionString = @"Data Source = localhost\SQLEXPRESS;" + 
            "Initial Catalog = Inputs; Integrated Security = SSPI";

        try
        {
            // Setup our command.
            SqlCommand theCommand = new SqlCommand("SELECT * FROM Inputs", connectSQL);

            // Write the stored value in the text boxes.
            connectSQL.Open();

            SqlDataReader theReader;

            theReader = theCommand.ExecuteReader();
            theReader.Read();
            MessageBox(theReader["ApplicationName"].ToString());

            theReader.Close();
            connectSQL.Close();
        }
        catch (Exception ee)
        {
            MessageBox("Oopsie: " + ee);
        }       

 private void MessageBox(string msg)
    {
        Label lbl = new Label();
        lbl.Text = "" + Environment.NewLine + "window.alert('" + msg + "')";
        Page.Controls.Add(lbl);
    }

Answer 1

You are basically just sending "window.alert('your message');" as HTML to the browser, this wont execute as JavaScript. Do you really want it to be a "popup"? If so consider using RegisterStartupScript() instead of outputting the JS via a label (http://msdn.microsoft.com/en-us/library/asz8zsxy.aspx). If not then why not just set the contents of the label to your return message?

Answer 2

Sample taken from MSDN & modified for your example

private void MessageBox(string msg)
{
    StringBuilder cstext2 = new StringBuilder();
    cstext2.Append("<script type=\"text/javascript\">");
    cstext2.Append("window.alert('" + msg + "')} </");
    cstext2.Append("script>");
    ClientScript.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString(), false);
}

You could also use RegisterStartupScript instead of RegisterClientScriptBlock.

EDIT: OR the classic ASP way should also work.
I am writing this without any editor.

Response.Write(@"<script language='javascript'>window.alert('" + msg + "');</script>");

Answer 3

It does execute actually. I use this in other code and that messagebox function works fine on other projects.

Here's what I really want to do:

try
        {
            // Setup our command.
            SqlCommand theCommand = new SqlCommand("SELECT * FROM Inputs", connectSQL);

            // Write the stored value in the text boxes.
            connectSQL.Open();

            SqlDataReader theReader;

            theReader = theCommand.ExecuteReader();
            theReader.Read();
            TextBox6.Text = (theReader["ApplicationName"].ToString());

            theReader.Close();
            connectSQL.Close();
        }
        catch (Exception ee)
        {
            MessageBox("Oopsie: " + ee);
        }       

Note that TextBox6 is an ASP text box on the website. Clicking TestSubmit does not show the text.