private void uartWriteButton_Click(object sender, EventArgs e) { string inputStr = uartComboBox.Text; string[] strAry = null; int len = 0; string ipstr = ipAddrTextBox.Text; string gpibAddr = "inst29"; string resp; byte[] byteAry1 = null; if (inputStr == string.Empty) { return; } if (inputStr.Contains(@"/")) { // this is in hex strAry = inputStr.Split(new char[] { '/' }); } else { if (!newLineCheckBox1.Checked) { Regex regex = new Regex(@"\\n"); Match m = regex.Match(inputStr); if (m.Success) { byteAry1 = Encoding.ASCII.GetBytes(inputStr.ToCharArray(), 0, inputStr.Length - 1); byteAry1[inputStr.Length - 2] = 0x0a; // putting newline in ascii } else { byteAry1 = Encoding.ASCII.GetBytes(inputStr); } } else { // check box is check, add new line to the input string inputStr = inputStr + Environment.NewLine; byteAry1 = Encoding.ASCII.GetBytes(inputStr); } len = byteAry1.Length; //byte[] newline = Encoding.ASCII.GetBytes(Environment.NewLine); } VXI11Class remote_inst = new VXI11Class(gpibAddr, ipstr); remote_inst.uartWriteBytes(len, byteAry1); remote_inst.close(); uartRespTextBox.AppendText("uart write:"); uartRespTextBox.AppendText(inputStr); }