A2 10th assignment operator and Implementation Adder Calculator

Chapter II, section 10th
1, there can be only one variable on the left, and the left must be a variable
2, Calculator WinForm
1, drag the control (one button, two label, two textbox)
2, double-click Write event for button
3,result
4, get the input text information
5, select the button, switch to the lightning bolt check Click
6, write method to click event
7,
{
String S1=txtnum1.text;
String S2=txtnum2.text;
String s=s1+s2;
Labelresult.text=s;
}

8, converts the input string to an integer addition
{
String S1=txtnum1.text;
String S2=txtnum2.text;
int I1=convert.toint32 (S1);
int i2=convert.toint32 (s2);
int result=i1+i2;
Labelresult.text=convert.tostring (Result)//result. ToString (); //result integer value converted to String type
}

A2 10th assignment operator and Implementation Adder Calculator