As keyword c#

As c#

 // taking a string variable 
string str1 = "GFG"; 

// taking an Object type variable 
// assigning var1 to it 
object obj1 = str1; 

// now try it to cast to a string 
string str2 = obj1 as string;

//here, 'as' is used to cast the object obj1 to a string,
//as the object already contained data of a string object

Source: grepper.com

As c#

SomeType x = y as SomeType;
if (x != null)
{
  // Do something
}

Source: grepper.com

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