out var with C# 7

outvar.cs

// C# 6
string n = "42";
int result;
if (string.TryParse(n, out result)
{
  Console.WriteLine($"Converting to a number was successful: {result}");
}

// C# 7
string n = "42";
if (string.TryParse(n, out var result)
{
  Console.WriteLine($"Converting to a number was successful: {result}");
}