How to bind data selected from Dropdown List in label in stead of gridview using asp.net c#

protected void Page_Load(object sender, EventArgs e)
        {
          

        }

        protected void drplist_SelectedIndexChanged(object sender, EventArgs e)
        {
            string selectvalue = (((DropDownList)sender).SelectedValue).ToString();

                SqlConnection cnn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString);
                try
                {
                    SqlCommand cmd = new SqlCommand();
                    cmd.Connection = cnn;
                    cmd.Parameters.Add("@Email", SqlDbType.VarChar).Value = selectvalue;
                    cmd.CommandText = "select * from tbl_Registration where Email=@Email";
                    
                    cmd.CommandType = CommandType.Text;
                    cnn.Open();
                    SqlDataReader reader = cmd.ExecuteReader();
                    
                   GridView1.DataSource = reader;
                  GridView1.DataBind();

                    cnn.Close();
                }
                catch (Exception ex)
                {
                    Response.Write(ex.Message);
                    if (cnn.State == ConnectionState.Open)
                    {
                        cnn.Close();
                    }
                }
                finally
                {
                    if (cnn.State == ConnectionState.Open)
                    {
                        cnn.Close();
                    }
                }

            }