我刚写了一个编写计算器的代码，但是调试的时候出现了问题，请你给我指点
// Insert page code here
//

void Button1_Click(object sender, EventArgs e)
{

edit1.Text = edit1.Text +'1';


}

void Button2_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'2';
}

void Button3_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'3';
}

void Button4_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'4';
}

void Button5_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'5';
}

void Button6_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'6';
}

void Button7_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'7';
}

void Button8_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'8';
}

void Button9_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'9';
}

void Button0_Click(object sender, EventArgs e) {
edit1.Text = edit1.Text +'0';
}

void Button12_Click(object sender, EventArgs e) {
edit1.Text="";//清除文本框
}

void Button13_Click(object sender, EventArgs e) {
//int n=1;//为加法变量设置标志变量
string temp1;
temp1=edit1.Text;
edit1.Text="";
}

void Button14_Click(object sender, EventArgs e) {
//int n=2;
string temp1;
temp1=edit1.Text;
edit1.Text="";
}

void Button15_Click(object sender, EventArgs e) {
//int n=3;
string temp1;
temp1=edit1.Text;
edit1.Text="";
}

void Button16_Click(object sender, EventArgs e) {
//int n=4;
string temp1;
temp1=edit1.Text;
edit1.Text="";
}

void Button11_Click(object sender, EventArgs e) {
double temp2;
string temp1;
  Button PressedButton = (Button)sender;
   switch (PressedButton.ID)
    {
     case "Button13":
       temp2 = Convert.ToDouble(temp1)+Convert.ToDouble(edit1.Text);
     case "Button14":
       temp2 = Convert.ToDouble(temp1)-Convert.ToDouble(edit1.Text);
      case "Button15":
       temp2 = Convert.ToDouble(temp1)*Convert.ToDouble(edit1.Text);
     case "Button16":
       temp2 = Convert.ToDouble(temp1)/Convert.ToDouble(edit1.Text);
    }
    edit1.Text=temp2.ToString();
}