C#

myDeleteButton = (LinkButton)myTableCell.Controls[0];

myDeleteButton = myTableCell.Controls[0] as LinkButton;
if (myDeleteButton != null) { ... }

private async void CreateClient()
  {
      try
      {
          //Create the StreamSocket and establish a connection to the echo server.
          socket = new Windows.Networking.Sockets.StreamSocket();

          Windows.Networking.HostName serverHost = new Windows.Networking.HostName("192.168.1.19");//localhost");


          string serverPort = "7001";
          await socket.ConnectAsync(serverHost, serverPort);


          //Read data from the echo server.
          Stream streamIn = socket.InputStream.AsStreamForRead();
          streamIn.Flush();
          StreamReader reader = new StreamReader(streamIn);

          while (true)
          {
              //client receive
              string response = await reader.ReadLineAsync();
          }
      }
      catch (Exception e)
      {
          //Handle exception here.
      }
  }

Stream streamIn = socket.InputStream.AsStreamForRead();
// Remove this (should be not necessary)
// streamIn.Flush();
StreamReader reader = new StreamReader(streamIn);

// Send data to the server here after the input stream has been created

while (true)
{
    //client receive
    string response = await reader.ReadLineAsync();
}

"Select Count(*) from Login where Username = '" + Username_text + "' and Password= '" + Password_text + "'"
                              ^