generic way to check null or empty for any type like int, string, double

Question

I am trying t get this working but somehow its going out of my hand... I want to be able to check null or empty to whatever type i assigned.

EX:

int i =0;
string mystring = "";

var reult  = CheckNullOrEmpty(10) // passing int
var result 1  = CheckNullOrEmpty(mystring) // passing string 

 public bool CheckNullOrEmpty<T>(T value)
 {
    // check for null or empty for strings
    // check for null i.e. 0 for int 

 }

can someone help me with this.. I am trying to understand how generics works for this simple method.

Answer 1

public static bool CheckNullOrEmpty<T>(T value)
{
     if (typeof(T) == typeof(string))
        return string.IsNullOrEmpty(value as string);

     return value == null || value.Equals(default(T));
}

How to use:

class Stub { }

bool f1 = CheckNullOrEmpty(""); //true
bool f2 = CheckNullOrEmpty<string>(null); //true
bool f3 = CheckNullOrEmpty(0); //true
bool f4 = CheckNullOrEmpty<Stub>(null);  //true

Answer 2

You can check against default(T);

 public bool CheckNullOrEmpty<T>(T value)
 {
      return value == default(T);
 }

For more informations: http://msdn.microsoft.com/en-us/library/xwth0h0d.aspx