public void LogInTroughDB()
    {

        string serverName = "10.255.2.140\ADMIN\adminDB,1433";
        string userID = "admin";
        string password = "admin";
        SqlConnection cnn;
        string connetionString = null;
        connetionString = @"Server=" + serverName + ";Initial Catalog=master;User ID=" + userID + ";Password=" + password;
        cnn = new SqlConnection(connetionString);
        try
        {
            cnn.Open();
           //MessageBox.Show("Connection Open!");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Connection Error!");
        }


        string sqlquery = ("SELECT * FROM dbo.Users WHERE (machine_name ='"+machine_name+"')"); ;
        SqlCommand command = new SqlCommand(sqlquery, cnn);
        SqlDataReader sReader;
        sReader = command.ExecuteReader();
         while(sReader.Read()) {
            first_name = sReader["first_name"].ToString();
            last_name = sReader["last_name"].ToString();
            userNameText.Text = first_name + " " + last_name;
        }
    }