View Compilation Error

0_0_2371510_23150.c:1: error: syntax error before "System"
0_0_2371510_23150.c:2: error: syntax error before "System"
0_0_2371510_23150.c:10: error: syntax error before '{' token
0_0_2371510_23150.c:18: error: syntax error before "void"
0_0_2371510_23150.c:18: error: syntax error before "sender"
0_0_2371510_23150.c: In function `button1_Click':
0_0_2371510_23150.c:20: error: syntax error before "int"
0_0_2371510_23150.c:21: error: syntax error before "int"
0_0_2371510_23150.c:24: error: `textBox3' undeclared (first use in this function)
0_0_2371510_23150.c:24: error: (Each undeclared identifier is reported only once
0_0_2371510_23150.c:24: error: for each function it appears in.)
0_0_2371510_23150.c:24: error: request for member `ToString' in something not a structure or union
0_0_2371510_23150.c: At top level:
0_0_2371510_23150.c:27: error: syntax error before '}' token