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How to refer to the sender object?

SnapCrakllPop (17)
Okay I'm trying to write one function to handle all button clicks in my TicTacToe game (it's just a practice project).

Right now I have 9 functions, one for each button. Here's the function for button1:
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private: System::Void button_DoClick1(System::Object^ sender, System::EventArgs^ e)
	{
		if(b1val == 0)
		{
			if(player == 1)
			{
				Button^ NewBut = *sender;
				button1->BackgroundImage = System::Drawing::Image::FromFile("S:\\tictactoe\\release\\x.jpg");
				bval1 = 1;
				player = 2;
				label1->Text=L"Player 2 Turn";
			}
			else if(player == 2)
			{
				button1->BackgroundImage = System::Drawing::Image::FromFile("S:\\tictactoe\\release\\o.jpg");
				bval1 = 2;
				player = 1;
				label1->Text=L"Player 1 Turn";
			}
			b1val = 1;
			turns++;
		}
		else
		{
			if(winner == 0)
				MessageBox::Show("This space has already been used!");
		}
		CheckWinner();
	}


I have 9 of these. Picture how redundant that is lol. So how would I refer to the button that was clicked, rather than hard code "button1->BackgroundImage etc."

I tried this:
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sender->BackgroundImage = System::Drawing::Image::FromFile("S:\\tictactoe\\release\\x.jpg");

//and

this->BackGroundImage = System::Drawing::Image::FromFile("S:\\tictactoe\\release\\x.jpg");


The first one throws an error:
error C2039: 'BackgroundImage' : is not a member of 'System::Object'


The latter one simply changes the background of the entire button ><

SnapCrakllPop (17)
Did some digging on my own and found the solution:

Button^ ctrl = safe_cast<Button^>(sender);

#Solved

(:
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