string operation ="";
		bool newNum = false;
		double numMemory;
		bool decimalPushed =false;

		void ButtonAddClick(object sender, System.EventArgs e)
		{
			operation ="+";
			newNum = true;
			numMemory = Convert.ToDouble(Display.Text);
		}
		
		void ButtonMultiplyClick(object sender, System.EventArgs e)
		{
			operation ="x";
			newNum = true;
			numMemory = Convert.ToDouble(Display.Text);
		}
		
		void ButtonDivideClick(object sender, System.EventArgs e)
		{
			operation ="/";
			newNum = true;
			numMemory = Convert.ToDouble(Display.Text);
		}
		
		void ButtonMinusClick(object sender, System.EventArgs e)
		{
			operation ="-";
			newNum = true;
			numMemory = Convert.ToDouble(Display.Text);
		}
		void ButtonEqClick(object sender, System.EventArgs e)
		{
			if (operation == "+")
			{
				if (newNum)
				{
					numMemory = Convert.ToDouble(Display.Text);
					newNum = false;
				}
				double displayValue = Convert.ToDouble(Display.Text);
				displayValue = numMemory + displayValue;
				Display.Text = displayValue.ToString();
			}
			if (operation == "-")
			{
					if (newNum)
			 {
				 numMemory = Convert.ToDouble(Display.Text);
				 newNum = false;
			 }
				double displayValue = Convert.ToDouble(Display.Text);
				displayValue = numMemory - displayValue;
				Display.Text = displayValue.ToString();
			}
			if (operation == "x")
			{
				if (newNum)
				{
					numMemory = Convert.ToDouble(Display.Text);
					newNum = false;
				}
				double displayValue = Convert.ToDouble(Display.Text);
				displayValue = numMemory * displayValue;
				Display.Text = displayValue.ToString();
			}
			if (operation == "/")
			{
				if (newNum)
				{
					numMemory = Convert.ToDouble(Display.Text);
					newNum = false;
				}
				double displayValue = Convert.ToDouble(Display.Text);
				displayValue = numMemory / displayValue;
				Display.Text = displayValue.ToString();
			}
		}