how to read data from serial port in c#

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C#

C#4.0

hello All
I am using serialport communication code in my project but it is not reading data
tel me the solution for this
i am using the folloing method for reading data from serialport

private void Read_Click(object sender, EventArgs e)
        {
            try
            {
                //clear the text box
                textBox.Text = "";
                //read serial port and displayed the data in text box
                textBox.Text = sp.ReadLine();


            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }

        }