ben dünyanın en iyi bilgisayar programcısıyım

static void main()
{
application.run(new form1());
}


private void button1_click_1(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+1;
}

private void button2_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+2;

}

private void button3_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+3;
}

private void button4_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+4;
}

private void button5_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+5;
}

private void button6_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+6;
}

private void button7_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+7;
}

private void button8_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+8;
}

private void button9_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+9;
}

private void button11_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+0;
}

private void button13_click(object sender, system. eventargs e)
{
tut();
islem='+';

}
private void tut()
{
i=double. parse(textbox1.text);
textbox1.text="";
}

private void button14_click(object sender, system. eventargs e)
{
tut();
islem='-';
}

private void button15_click(object sender, system. eventargs e)
{
tut();
islem='*';
}

private void button16_click(object sender, system. eventargs e)
{
tut();
islem='/';
}

private void button12_click(object sender, system. eventargs e)
{
j=double. parse(textbox1.text);
textbox1.text="";
double y=0;
switch (islem)
{
case '+':
y=i+j;
break;
case '-':
y=i-j;
break;
case '*':
y=i*j;
break;
case '/':
y=i/j;
break;
}
textbox1.text=y.tostring();



}

private void button10_click(object sender, system. eventargs e)
{
textbox1.text=textbox1.text+'.';
}
}
}

c# Akarrrr