Types of Classes in C#

Many Many thanks sir

For abstarct class, We can inherit two abstract classes; in this case, implementation of the base class method is optional, this statement is totally wrong, please explain further.

I can inherit class from and by partial class in C# 7.3 "Inheritance cannot be applied on partial classes."

Thanks for sharing your knowledge. Its very helpful.

Thank you for sharing your knowledgeable & valuable article with us.

In general for a class we can apply public or internal. Access modifiers are not applied to a sealed class . this is wrong. we can apply access modifiers to the sealed class. if not can you please explain. how ?. i having doubt on this sentence.

Methods inside the abstract class cannot be private.......this is wrong.....Non abstract Methods inside the abstract class can be private.

An Abstract class has only one subclass....What is this?...I think we can inherit abstract class on n number of subclasses

"Inheritance cannot be applied on partial classes." - Can you please explain?

Can we use access specifier with class rather than public and internal?

Very nice explanation useful share

using System; /* Author : Alfred ,Ali,Jude Date : July 14,August,2014 Purporse : Move Grid Puzzle.This has table of values with random and one blank cell we have to arrange it in order. Input : 0 5 8 7 4 3 2 6 1 Output : 1 2 3 4 5 6 7 8 0 */ class MoveGridPuzzle { private int[,] Grid=new int[3,3]; private string _ValidMove; private int CurRow,CurCol; public MoveGridPuzzle() { Reset(); } // Default Grid Position at Start/Replay of Game public void Reset() { Grid[0,0]=0;Grid[0,1]=5;Grid[0,2]=8; Grid[1,0]=7;Grid[1,1]=4;Grid[1,2]=3; Grid[2,0]=2;Grid[2,1]=6;Grid[2,2]=1; CurRow=0;CurCol=0; SetValidMove(); } // Check if the Player is Won public bool IsWon() { for(int i=Grid.GetLowerBound(0);i<=Grid.GetUpperBound(0);i++) { for(int j=Grid.GetLowerBound(1);j<=Grid.GetUpperBound(1);j++) { // If the Last Position is zero and remaining position // are valid then return true if(i==Grid.GetUpperBound(0) && j==Grid.GetUpperBound(1)) { return true; } else { if(Grid[i,j]!=(3*i)+j+1) { return false; } } } } return true; } // Check if the Move performed is valid or not private bool IsMoveValid(string Move) { return (ValidMove.IndexOf(Move))>=0?true:false; } // Property to get and set ValidMove private string ValidMove { get { return _ValidMove; } set { _ValidMove=value; } } //Function to set Valid Move Position from Current Position private void SetValidMove() { string Move; switch(CurRow) { case 0: Move="D"; break; case 1: Move="UD"; break; case 2: Move="UD"; break; default: Move=""; break; } switch(CurCol) { case 0: Move+="R"; break; case 1: Move+="LR"; break; case 2: Move+="L"; break; default: Move=""; break; } ValidMove=Move; } // Set Value to the Grid Position private int this[int row,int col] { get { return Grid[row,col]; } set { Grid[row,col]=value; } } //Perform Move here.Change Grid Position Values if the Move is Valid private void Play() { bool IsNotGameDone=true; string MoveTo; do { ShowGrid(); Console.Write("Enter your Move [L,R,U,P,E]: "); MoveTo=Console.ReadLine().ToUpper(); if(IsWon()) { Console.WriteLine("You Won the Game!!"); MoveTo="E"; } if(IsMoveValid(MoveTo)) { switch(MoveTo) { case "L": case "l": SwapPosition(CurRow,CurCol,CurRow,CurCol-1); break; case "R": case "r": SwapPosition(CurRow,CurCol,CurRow,CurCol+1); break; case "U": case "u": SwapPosition(CurRow,CurCol,CurRow-1,CurCol); break; case "D": case "d": SwapPosition(CurRow,CurCol,CurRow+1,CurCol); break; } SetValidMove(); } else { switch(MoveTo) { case "E": case "e": IsNotGameDone=false; if(!IsWon()) { Console.WriteLine("You Lose the Game"); } break; default: Console.WriteLine("Invalid Move or Choice"); break; } } }while(IsNotGameDone); } //Show Grid private void ShowGrid() { Console.WriteLine("+===+===+===+"); for(int i=Grid.GetLowerBound(0);i<=Grid.GetUpperBound(0);i++) { Console.Write("+"); for(int j=Grid.GetLowerBound(1);j<=Grid.GetUpperBound(1);j++) { Console.Write(" {0} +",this[i,j]); } Console.WriteLine(); } Console.WriteLine("+===+===+===+"); } // Reassign the Grid Value after the move private void SwapPosition(int FromRow,int FromCol,int ToRow,int ToCol) { int Temp; Temp=this[FromRow,FromCol]; this[FromRow,FromCol]=this[ToRow,ToCol]; this[ToRow,ToCol]=Temp; CurRow=ToRow; CurCol=ToCol; } public static void Main() { MoveGridPuzzle GameObject=new MoveGridPuzzle(); GameObject.Play(); } }

I want to create a class in a certain program that will count the moves in the game.here is the source code

sure,wait i will update my article soon

We can inherit two abstract classes; in this case the base class method implementation is optional...what is this???explain it plz...