//Optional Parameter-Only in 2010(4.0)
public void a1(int a, int c,int b = 2)
{
}
//named parameters
public void a11(int a, int c=6, int b = 2)
{
}
//without nullable parametrs
int a = 0;
public void dd()
{
a = null;//cant assign to null to int throw error but if we use nullable paramaetrs dont show error
}
//nullable parametrs
int? a = 0;
public void dd()
{
a = null;
}
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