Hello,  

I was trying to retrieve data inside a static method and display the data on a non-static label inside a static method. The important thing is, as soon as I type the correct username into the txtUsername, I want the non-static lblemailshow to display the retrieved email inside the static method without clicking a button. I couldn’t get a good solution because all google search says I can’t use non-static control inside a static method. Below is what I tried. Is there anyway that I can call lblemailshow.Text inside a static method?

[WebMethod()]
public static string CheckName(string userName)
{
    string returnValue;
    try
    {
        string conString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
        SqlConnection conn = new SqlConnection(conString);
        SqlCommand cmd = new SqlCommand(@"IF NOT EXISTS(SELECT * FROM Table_1 WHERE Username = @Name)
                                SELECT 'true'
                                ELSE
                                SELECT 'false'", conn);
        cmd.Parameters.AddWithValue("@Name", userName.Trim());
        SqlDataReader Rder = cmd.ExecuteReader();
        conn.Open();
        if (Rder.HasRows == true)
            Rder.Read();
        string Rd_Email = Rder[2].ToString();
        lblemailshow.Text = Rd_Email; //
        returnValue = Convert.ToString(cmd.ExecuteScalar());
        conn.Close();
    }
    catch (Exception)
    {
        returnValue = "error";
    }
 
    return returnValue;
}

<asp:Panel runat="server">
    <asp:UpdatePanel runat="server">
        <ContentTemplate>
            <asp:Label ID="lblemailshow" runat="server"></asp:Label>
            <asp:TextBox ID="txtUsername" runat="server" autocomplete="off" onChange="UsernameAvailability()" onkeyup="UsernameAvailability()" 
                ondrop="return false;" onpaste="return false;"></asp:TextBox>
            <span id="Username_Check"></span>
        </ContentTemplate>
        <Triggers>
        </Triggers>
    </asp:UpdatePanel>
</asp:Panel>