Please what's causing and solving of this error message

basim salih

Please what's causing and solving of this error message in C# (Index was out of range Must be non-negative and less //thanthe size of the collection

//Parameter name:index)?

// and attachment the detail for code

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajkiran Swain9y ago
Accepted answer
The error is pretty clear: You are accessing a collection of some form (list, array or other) using an index which is either negative, or larger than the index of the last value in the collection.

For example, if you have a list or an array that you are accessing in a loop, the loop counter must be less than the items count:
for (int i = 0; i < myCollection.Length; i++)
{
    Console.WriteLine(myCollection[i]);
}
Will be fine, but
for (int i = 1; i <= myCollection.Length; i++)
{
    Console.WriteLine(myCollection[i]);
}
Won't
basim salih9y ago
Thank you very much my friend for your answer ... i know what the error message is mean ..
But ...

When I cleared the datatable (dt) an error occurred …. I didn’t deal with any index of collection directly in this command: dt.clear(); plz look more in the details and code attached … thankyou my friend again...