how to show status in a label in asp .net?

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Hello! i have one textbox and a label. Here my query is that whenever i"ll start writing in the textbox immediately label will show a message "This username is unavailable" or "This username is available"(textbox data will search in database for username). I've written the following code. But it's working only whenever I"m Pressing "Enter" switch in the textbox. I want that should happen without using of "Enter" switch.

I have enabled AutoPostBack=true for textbox.

Source Code:

XML

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" CausesValidation="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

C# Code:

C#

protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        try
        {
            SqlCn.Open();
            SqlCommand SqlCmd = new SqlCommand("SELECT Manufacturer FROM MOBILE WHERE Manufacturer='" + TextBox1.Text + "'", SqlCn);
            SqlDataAdapter adapter = new SqlDataAdapter(SqlCmd);
            SqlDataReader SqlDr = SqlCmd.ExecuteReader();
            if (SqlDr.Read())
            {
                Label1.Text = "This username is unavailable.";
            }
            else
            {
                Label1.Text = "This username is available";
            }
        }
        catch (Exception ex)
        {
            string msg = ex.Message;
        }

Posted 22-Apr-13 5:01am

Chiklu.Soumya

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Maksud Saifullah Pulak · Answer 1 · 2013-04-22T05:12:00

First write this code in your .ASPX.

XML

<div id="divMessage" runat="server" class="" style="display: none;">
       <asp:Literal runat="server" ID="ltlMessage" Text="test"></asp:Literal>
   </div>

Then just write this code behind you .CS page.

C#

public static void ShowMessage(string _class, string msg, System.Web.UI.HtmlControls.HtmlGenericControl divMessage, Literal ltlMessage)
       {
           divMessage.Style.Add(&quot;display&quot;, &quot;block&quot;);
           divMessage.Attributes.Add(&quot;class&quot;, _class);
           ltlMessage.Text = msg;
       }</pre>

C#

try
               {
                   UISettings.ShowMessage("alert alert-success", "Insert Successfully", divMessage, ltlMessage);
               }
               catch (Exception ex)
               {
                   ShowMessage("alert alert-error", ex.InnerException.Message, divMessage, ltlMessage);
               }