User Role Display & User Roles

 I have 2 problems with roles
1. I cannot display the role a current user is in using a label control
my code is   RoleLabel.Text = Convert.ToString(Roles.GetRolesForUser(UserID));
the error I get is : Cannot Implicitly convert type []string to string
 
2. I have codebehind using IsUserInRole to route to the proper method to use depending upon the user
if (roles.IsUserInRole(UserID, "Customer")
{Get_Customer_Info();}
if (roles.IsUserInRole(UserID, "Employee")
{Get_Employee_Info();}
 The information does not display on the page, but when I delete the if statements (or switch no matter) it works, but if an employee is logged in or customer is logged in I have to read all info just to make sure it gets displayed, when what I want to do is only read and display info needed (customer or employee)
Now each person is only in one role, not multiple roles. ...