C#

Working around a puzzle slider game, using picturebox and tag properties. After the form has reshuffled the images, I set a function void IsWin()  using if statement to check the arrangement upon completion and display an output. but after arranging the scrabbled images the message box in the if statement doesn't pop up.

I will be glad if some anyone can help me identify what i am doing wrong. Thank you

Code for the shuffled images

private void Form1_Load(object sender, EventArgs e)
        {
            
            /////////////////////
            Image p1 = pic1.Image;
            string tag1 = pic1.Tag.ToString();
            pic1.Tag = pic8.Tag;
            pic8.Tag = tag1;
            pic1.Tag = pic8.Tag;
            pic1.Image = pic8.Image;
            pic8.Image = p1;

            Image p2 = pic4.Image;
            string tag2 = pic4.Tag.ToString();
            pic4.Tag = pic12.Tag;
            pic12.Tag = tag2;
            pic4.Image = pic12.Image;
            pic12.Image = p2;

            Image p3 = pic3.Image;
            string tag3 = pic3.Tag.ToString();
            pic3.Tag = pic10.Tag;
            pic10.Tag = tag3;
            pic3.Image = pic10.Image;
            pic10.Image = p3;


            Image p4 = pic2.Image;
            string tag4 = pic2.Tag.ToString();
            pic2.Tag = pic11.Tag;
            pic11.Tag = tag4;
            pic2.Image = pic11.Image;
            pic11.Image = p4;


            Image p5 = pic5.Image;
            string tag5 = pic5.Tag.ToString();
            pic5.Tag = pic13.Tag;
            pic13.Tag = tag5;
            pic5.Image = pic13.Image;
            pic13.Image = p5;

            Image p6 = pic6.Image;
            string tag6 = pic6.Tag.ToString();
            pic6.Tag = pic14.Tag;
            pic14.Tag = tag6;
            pic6.Image = pic14.Image;
            pic14.Image = p6;

            Image p7 = pic7.Image;
            string tag7 = pic7.Tag.ToString();
            pic7.Tag = pic16.Tag;
            pic16.Tag = tag7;
            pic7.Image = pic16.Image;
            pic16.Image = p7;

        }

code for the function Void IsWin()

public void IsWin()
{

    if ((string)pic1.Tag == "1" && (string)pic2.Tag == "2" &&
       (string)pic3.Tag == "3" && (string)pic4.Tag == "4" &&
       (string)pic5.Tag == "5" && (string)pic6.Tag == "6" &&
        (string)pic7.Tag == "7" && (string)pic8.Tag == "8" &&
        ((string)pic9.Tag == "9" && (string)pic10.Tag == "10" &&
       (string)pic11.Tag == "11" && (string)pic12.Tag == "12" &&
       (string)pic14.Tag == "14" && (string)pic13.Tag == "13" &&
        (string)pic15.Tag == "15" && (string)pic16.Tag == "Blank"))
    {
        MessageBox.Show("You Win with " +move+" Moves.");
        won.Play();
        this.Close();
    }
}

 var pickLoc = document.getElementById('_pickLoc');//_pickLoc is a Hidden Variable

for (i=1; i<=lastRow; i++) 
    {
        var dataStr;
        var localvar;
       
	  //Validating Container number
      var aRow = document.getElementById('txtRow' + i);
      if (aRow.value.length <= 0) 
      {
        alert('Row ' + i + ': Container number is empty');
        document.getElementById('txtRow' + i).style.backgroundColor = "#ffff99";
        document.getElementById('txtRow' + i).focus();
        return;
       }
       else {
            
            document.getElementById('txtRow' + i).style.backgroundColor = "";
			dataStr = "<tr><td height=5></td></tr><tr><td><FONT face='Verdana' size='1'>";
			dataStr += document.getElementById('txtRow' + i).value;
			dataStr += "</Font></td><td><FONT face='Verdana' size='1'>";
        }
       
       //_cntrSize
      	var e = document.getElementById('_cntrSize' + i);
	  if (e.options[e.selectedIndex].value == "") 
	  {
		 //dataStr +=  '</td></tr><tr>';
		 alert('Row ' + i + ': Container Size is empty');
		 e.style.backgroundColor = "#ffff99";
         e.focus();
         return;
		}
       else {
			 e.style.backgroundColor = "";
			 dataStr += e.options[e.selectedIndex].value;
			 dataStr +=  "</Font></td><td><FONT face='Verdana' size='1'>";
		}
		
		//Pickup Location Type
      var LocRow = document.getElementById('txtLocRow' + i);
      if (LocRow.value.length <= 0) {
        alert('Row ' + i + ': Pick up location is empty');
        document.getElementById('txtLocRow' + i).style.backgroundColor = "#ffff99";
        document.getElementById('txtLocRow' + i).focus();
        return;
       }
       else {document.getElementById('txtLocRow' + i).style.backgroundColor = "";
			 dataStr += document.getElementById('txtLocRow' + i).value;
			 dataStr += "</Font></td><td><FONT face='Verdana' size='1'>";
			 localvar = document.getElementById('txtLocRow' + i).value;
        }
        pickLoc.Value = localvar; 	
	 ttlStr += dataStr;
    }

I have 3 classes overriding a function of base abstract class A. The child classes are 1, 2 & 3. Child classes override function "public abstract void hello(var1, var2)".

Following is what I want to implement:
abstract class A
{
public abstract void hello(var1, var2); // This will be only for class 1 & class 2 (Existing function)
public abstract void hello(var1, var2, var3); // Want to make this available for class 3 only. (Want to add this new function)
}


** Currently the above code throws error and wants me to implement the new inherited abstract function in class 1 & 2.

public abstract class Factory
    {
        private readonly object _instanceLock = new object();
        private Factory _instance = null;

        internal Factory GetInstance(Type t)
        {
            if (_instance != null) return _instance;
            if(t != typeof(Factory)) throw new InvalidOperationException("Factory can't created an instance not derived from " + typeof(Factory).FullName);

            lock (_instanceLock)
            {
                if (_instance != null) return _instance;
                Thread.MemoryBarrier();
                var assembly = Assembly.GetAssembly(t);
                _instance = (Factory)assembly.CreateInstance(t.FullName);
            }

            return _instance;
        }

        protected Factory() { /* Protected -> Singleton */ }
    }