How to check if Array[] exist

thanks alot Vulpes

Double idays = 60;
if (ldays >= 31)
 {
 Double t = ldays / 30;
 char[] s = { '.' };
 String[] lastmonth = t.ToString().Split(s);
 hipertensos.idade_txb.Text = "";
 string months = lastmonth[0].ToString();
 string days = null;
 if (Convert.ToInt32(lastmonth[1]) > lastmonth.Length ) error is there some time lastmonth[1] not exist sometime have value.......................
 {
 days = lastmonth[1].ToString();
 }
 else
 {
 days = "0";
}
hipertensos.idade_txb.Text = String.Format("{0:0}.{1:0}.{2:0}", years[0], months, days);
}
else
{
hipertensos.idade_txb.Text = String.Format("{0:0}.{1:0}.{2:0}", years[0], "0", idays );
                        }

Umm,
Silly kind of question if you only have two (0,1) elements in the array why are you looking at the third (2) why not limit the value to the max it can have in it in this case two,
so you have limit set to n-1, where n is the array size.
something like the following:

int limit_array = 0;

limit_arrray = array.GetLength();

for(int i = 0; i <= limit_array; i++)
{
}  

By keeping to the size of the array you won't need to venture into try....catch() land which can be painful!

To check if it exists but is null, you can do:

if (array.Count > 2 && array[2] == null)
{
    // do something
}

some time array[2] have value some time not have how to check if its null
thanks

You can use the ArrayList's Count property:

if (array.Count > 2)
{
    // do something with array[2]
}

Notice that array[2] can still exist but can have a value of null. You need to check for nullness separately.