Hello Everybody:
I am trying to develop a function to concate three strings . When I compile it gives me a compile error .Can anyone tell me whats wrong?

The error is :
Method 'Project01.Form1.Variable(string, string, string)' referenced without parentheses


public string Variable(string UserName, string PhoneNumber, string RemoteYN)
{
UserName= txtUserName.Text;
PhoneNumber= txtPhoneNumber.Text;
RemoteYN= txtRemoteString.Text;


return Variable= String.Concat( UserName, PhoneNumber, RemoteYN);