try{
  int value = int.Parse(text);
}catch(FormatException){
  //handle failure to convert
}catch(OverflowException){
 //handle failure to convert
}

  int value;
  bool success = int.TryParse(text,

void Configure(){
frmConfigure frmconf = new frmConfigure(Title, setting1, setting2);
if (frmconf.ShowDialog() == DialogResult.OK){
  setting1 = frmconf.Setting1;
  setting2 = frmconf.Setting2;
}

partial class frmConfigure{
public string Setting1

if (e.Modifiers == Keys.Control && e.KeyValue >='A' && e.KeyValue <='Z')
    int test = e.KeyValue - 'A' + 1;

string str="Hello World";
char[] strconv1 = str; //error CS0029: Cannot implicitly convert type 'string' to 'char[]'
char[] strconv2 = (char[]) str; //error CS0030: Cannot convert type 'string' to 'char[]'