public void WithOut()
{
string v1 = "dot";
string v2 = "net";
string v3 = "perls";
NullIf(v1);
NullIf(v2);
NullIf(v3);
//Debug.WriteLine(v1);
//Debug.WriteLine(v2);
//Debug.WriteLine(v3);
var sample1 = new Sample() { key = "Zero", Index = 0 };
var sample2 = new Sample() { key = "One", Index = 1 };
ChangeSample(sample1);
ChangeSample(sample2);
Debug.WriteLine(sample1.key);
Debug.WriteLine(sample2.key);
}
void ChangeSample(Sample value)
{
if (value.Index == 0)
value.key = "First";
}
