Question : Locking MySql Table from C#;

I am attempting to lock a mysql table from c# and have successfully done so, with one problem. I thought that ideally the table that I lock, would stay locked until I explicitly give the "Unlock Tables" command. The reason I ask is that I have to execute a select query and an update query on a table before allowing anyone else to access it. It appears that within my application(2 instances running), I can lock a table from the first instance, attempt to read a value from that table from the second instance(which hangs), and the second I read a value from the first instance the second instance unhangs and completes the execution. It seems that the table lock is released the moment a command is given to that table from the locking instance. Any insight on this?????????????????

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             //G1.conn1 returns a new instance of a connection to the database.		
 
                private void btnLock_Click(object sender, System.EventArgs e)
		{
			MySqlCommand cmd = new MySqlCommand("Lock Table TestTable write, TestTable as t1 write", G1.conn1);
			G1.TryNonQueryStatic(cmd);
		}
 
		private void btnUnlock_Click(object sender, System.EventArgs e)
		{
			MySqlCommand cmd = new MySqlCommand("Unlock Tables",G1.conn1);
			G1.TryNonQueryStatic(cmd);
		}
 
		private void btnWrite_Click(object sender, System.EventArgs e)
		{
			Double dd;
			if((txtWrite.Text.Length > 0)&&(Double.TryParse(txtWrite.Text,System.Globalization.NumberStyles.Number,null,out dd)))
			{
				MySqlCommand cmd = new MySqlCommand("Update testtable as t1 set testdouble = " + Double.Parse(txtWrite.Text).ToString(),G1.conn1);
				int affected = G1.TryNonQueryStatic(cmd);
				MessageBox.Show("Affected = " + affected.ToString());
			}
			else
				MessageBox.Show("Textbox value is invalid");
		}
 
		private void btnRead_Click(object sender, System.EventArgs e)
		{
			MySqlCommand cmd = new MySqlCommand("Select testdouble from testtable",G1.conn1);
			lblRead.Text = G1.TryScalarStatic(cmd);
		}
           
         

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Question : Locking MySql Table from C#;

Answer : Locking MySql Table from C#;

but you are closing the connection, which releases the locks also.
you have to do all the work on the same connection, without closing it.

Question : Locking MySql Table from C#;

Answer : Locking MySql Table from C#;

but you are closing the connection, which releases the locks also.you have to do all the work on the same connection, without closing it.

but you are closing the connection, which releases the locks also.
you have to do all the work on the same connection, without closing it.