Delete Duplicate Rows from DataTable in C#

 You have a Data Table-dt

 To remove duplicate records from dt.

for (int i = 0; i < dt.Rows.Count-1; i++) 
{ 
  for (int j = i+1; j < dt.Rows.Count; j++) 
  { 
    if (dt.Rows[i].ItemArray.SequenceEqual(dt.Rows[j].ItemArray)) 
      dt.Rows[j].Delete(); 
  } 
} 

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Difference between String and string

Let's Discuss difference between

                    String  and  string in c#

in one word :-

                          String is a class in dotnet class library

                          

                          string is a keyword

illustration ::

                    Here we go,consider the following program

//program1 
//program for just declaring a string variable 
using System; 
class Program 
{ 
static void Main(string[] args) 
  { 
  String str = "string vs String"; 
  } 
}

above program will run without any error but doesn't have any output.

Now  i remove the namespace System from the program,the code will looks like

//program2 
//program for just declaring a string variable 
class Program 
{ 
static void Main(string[] args) 
  { 
  String str = "string vs String"; 
  } 
}

if i try to run the program it will shows following error message

from the above two program we understood that

• String is class inside System Namespace
• Since You must import System to use String

Now if i replace String with string in program2 as below

//program3 
//program for just declaring a string variable 
class Program 
{ 
static void Main(string[] args) 
{ 
string str = "string vs String"; 
} 
}

program will run perfectly,So we may Conclude that

string keyword = System.String class

As always keywords always make the things more Simple.That means you can use variables of type string without using System namespace.

Done

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video tutorial

How to measure program execution time in C#

Please find original post from here

Tip showing how to measure time taken by a C# program using the class Stopwatch.

Stopwatch class provides a set of methods and properties that you can use to accurately measure elapsed time-by msdn

using System;
//don't forget to use namespace System.Diagnostics
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //creating object of Stopwatch
            Stopwatch myTimer = new Stopwatch();
            //strats timer
            myTimer.Start();
            //your program goes here
            //loop to add numbers between 0 and 10000
            int x = 0;
            for (int i = 0; i < 10000; i++)
            {
                x += i;
            }
            //stop timer after specific code under evaluation
            myTimer.Stop();
            //print time elapsed by the code in between Start() and Stop() methods.
            Console.WriteLine("time elapsed :" + myTimer.Elapsed);
            Console.ReadKey();
        }
    }
}

output for above code snippet was:-

Please find original post from here

-- Done --

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video tutorial