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I'm trying to get the amount from one of my tables in DB by using inline if in my controller
public ActionResult IfPaid(int id)
{
Ref_ViewModel = new View_model.View_Model();
Ref_ViewModel.GetAllCustomers(id).Any(p => p.Paid == false) ? RedirectToAction("Pay", "Account") : RedirectToAction("Download");
}
I get this error in the last line
Only assignment, call, increment, decrement, and new object expressions can be used as a statement
How can we fix this?

You should add a return statement:
public ActionResult IfPaid(int id)
{
Ref_ViewModel = new View_model.View_Model();
return Ref_ViewModel.GetAllCustomers(id).Any(p => p.Paid == false)
? RedirectToAction("Pay", "Account")
: RedirectToAction("Download");
}
As the error message says, the ternary operator on its own is not a statement. It can be part of another statement - e.g. return statement as above, or assignment statement
int value = condition ? 0 : 42;
Further reading: Statements (C# Programming Guide)