Question

The aim of this code is to repeat the question “Please enter your name” if the user does not input any data. However I am having trouble with making this work with the if statement.

while (true)
{
  Console.WriteLine("Please enter your name:");
  string line = Console.ReadLine();

  if (line=String.empty) //I'm having difficulty making this a valid statement
    Console.WriteLine("Your entry was blank");
  else break;
}

Answer 1

As looking your code, the error is in using making condition….You are using assignment operator(=) instead of comparision operator(==)……So do like this :

if (line == String.Empty)
{
       //Put your code
}

Or,You can simply do like this:

if (string.IsNullOrEmpty(line)) 
           Console.WriteLine("Your entry was blank");

Or, you can use string.IsNullOrWhitespace as Oded answer specified but it is only available in .NET 4 or above…..