Timer wait for 3 seconds C#

I am with this code below in what I call the class commport.cs that accesses the serial port.
I have 6 devices: ID01, ID02, ID03, ID04, ID05 and ID06.
The code sends the command id01 and accesses the device.
I need to receive the data and compare it really is the id01 device and the data are correct.
 
We give a time for the system receives the data and work through them.

Then send the command id02.
We give a time for the system receives the data and work through them.

And so in all six devices.

I am using for loop below to stop for a while,

for (int i = 0; i <= 10000; i + +)
                 for (int j = 0, j <= 10, j + +)
                 {}

however I would like to take this loop and make a stop with the timr_ID06 for 3 seconds and after that continue.

Or send the next command after received and compared the data.

I thought of using the System.Threading.Thread.Sleep (3000);
But i don´t know what happens if we put this code.

private void button26_Click(object sender, EventArgs e)
        {
            #region TRABALHA ID01
            timr_ID06.Enabled = true;
            Thread.Sleep(250);
            string s_ID01_c = "id01";
            CommPort com = CommPort.Instance;
            s_ID01_c = ConvertEscapeSequences(s_ID01_c); ;
            com.Send(s_ID01_c);
            #endregion

            for (int i = 0; i <= 10000; i++)
                for (int j = 0; j <= 10; j++)
                { }

            #region TRABALHA ID02
            //timr_ID06.Enabled = true;
            Thread.Sleep(250);
            string s_ID02_c = "id02";
            //CommPort com = CommPort.Instance;
            s_ID02_c = ConvertEscapeSequences(s_ID02_c); ;
            com.Send(s_ID02_c);
            #endregion

            for (int i = 0; i <= 10000; i++)
                for (int j = 0; j <= 10; j++)
                { }

        }

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