public const int constVal = 2;








public partial class Form1 : Form
{
  public readonly int readonlyVal = 2;
  public Form1()
  {
    readonlyVal = 5;
  }
}












public void throwException()
{
  try 
  {
    int y = 0;
    int x = 5 / y;
  }
  catch (Exception ex)
  {            
    throw new Exception("This is the user friendly message",ex);
  }
}






throw new Exception("This is the user friendly message",ex);








Response.Write(ex.Message); -- User Friendly Message
Response.Write(ex.InnerException.Message); -- .net generated message








public void ErrorRoutine()
{
  int x = 0;
  int y = 5 / x;
}
public void Errorcatchingroutine()
{
  try
  {
    ErrorRoutine();
  }
  catch (Exception ex)
  {
     throw;
  }
}



















•  With Equals you can compare 2 variables of different data type but in case of




string str = string.Empty;
int i = 0;
if (str == i)  // This line will give compile time errors.
{
	// Some Code
}
 if (str.Equals(i)) // This line of code will execute
{ 
	//Some Code
}



•  




StringBuilder sb1 = new StringBuilder("karan");
StringBuilder sb2 = new StringBuilder("karan");
if (sb1.Equals(sb2)) // This condition will return true
{ }
if (sb1 == sb2) // This condition will return false
{}










public interface I1
{
    string Display();
    string Display(string displayString);
}








public class test : I1
{
    public string Display()
    {
        return "null";
    }
    public string Display(string displayString)
    {
        return displayString;
    }
}






test obj = new test();
string str1 = obj.Display();
string str2 = obj.Display("Hi");
Response.Write(str1);
Response.Write(str2);
















public class Cat
{
	public  SpeakType Speak()
	{
		.......
	}
}

public class HomeCat : Cat
{
	public  override SpeakType Speak()
	{
		.......
	}
}

































      public class StaticClassOne
      {
        private int variableOne;
        private static int variableTwo;

        static StaticClassOne()
        {
           variableTwo = 2;
        }
        public StaticClassOne()
        {
           variableOne = 5;
        }                
      }







      StaticClassOne obj = new StaticClassOne();
      obj = new StaticClassOne();




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Posted By  -  Karan Gupta


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