Substring

In an aspx (asp2.0) page in C# I have a string array. The array contains
letters separated into two groups by a dash (-). I want to obtain the
letters before the dash. I use the following code. Strangely, when the
array has a value of "MOD-AS" Label3 displays "3" while Label4 displays -1.
What's going on ? What is changing the value of variable mn ? Thanks,
Jim

int i = 32;
string s1;
string s2;
s1 = Ante_Arr[i];
int mn = s1.IndexOf("-");
Label3.Text = mn.ToString(); // the displayed value is 3
try
{
s2 = s1.Substring(1, mn); // throws an error: length can not be less
than zero
}
catch
{
Label4.Text = mn.ToString(); // the displayed value is -1
}Maybe it's scope?

Put the int mn = s1.IndexOf("-"); line into the try block, or take a look at
the value of mn before the s2 = s1.Substring(1, mn); line.

"Jim McGivney" <mcgiv1@.no-spam.sbcglobal.net> wrote in message
news:O7EM879dGHA.3348@.TK2MSFTNGP03.phx.gbl...
> In an aspx (asp2.0) page in C# I have a string array. The array contains
> letters separated into two groups by a dash (-). I want to obtain the
> letters before the dash. I use the following code. Strangely, when the
> array has a value of "MOD-AS" Label3 displays "3" while Label4
> displays -1.
> What's going on ? What is changing the value of variable mn ? Thanks,
> Jim
> int i = 32;
> string s1;
> string s2;
> s1 = Ante_Arr[i];
> int mn = s1.IndexOf("-");
> Label3.Text = mn.ToString(); // the displayed value is 3
> try
> {
> s2 = s1.Substring(1, mn); // throws an error: length can not be less
> than zero
> }
> catch
> {
> Label4.Text = mn.ToString(); // the displayed value is -1
> }