How to get the Process Name in C#?

Question

Hello! I would like to write an application that can check if my application is running or not? What I know to do is checking the application is in the list of Process or not, e.g. demoapp.exe. I know that in C# we can use Process.GetProcess("demoapp"), but it always prompt for error, why? The following is my supposed method: private void Monitor() { string sProcessName = Process.GetProcess("demoapp"); string sCompare = "demoapp"; if(sProcessName=sCompare) { Process.Start("d:\temp\demoapp.exe"); } else { MessageBox.Show("The application is running","Warning"); } } Please give me reply asap. Thanks!