I want the code to open modbus

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C#

Can anyone tell me the c# code to open the modbus

What I have tried:

private void btnConnect_Click(object sender, EventArgs e)
{
try
{
master = new Master(txtIPAddress.Text, 502, true);
MessageBox.Show("Connection established");
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}