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Error trying to remove row from Datatable

Posted on 2007-04-10
4
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Last Modified: 2010-04-15
I am trying to remove a row from a DataTable..

The DataTable is stored in memory so removing this row dows not delete data from the database..

My code currently is


private void Delete_Record(int prodid)
    {
        DataTable dto = new DataTable();
        dto = ((DataTable)Session["prodDT"]);
        foreach (DataRow r in dto.Rows)
        {
            int id = Convert.ToInt32(r["ID"]);
            if (id == prodid)
            {
                dto.Rows.Remove(r);
            }
       }
    }

This give me an error

Collection was modified; enumeration operation might not execute.

Can someone help me out here..

0
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Question by:Prysson
  • 3
4 Comments
 
LVL 15

Accepted Solution

by:
igor_alpha earned 500 total points
ID: 18886716
Hi Prysson,
The problem, that you try to modify Rows collection when its already was modified inside foreach loop.
Best way to solve proble is looping from last row to first, so rows would be removed from end of table to its start.

private void Delete_Record(int prodid)
    {
        DataTable dto = new DataTable();
        dto = ((DataTable)Session["prodDT"]);
for(int i = dto.Rows.Count - 1; i == 0; i--)
{
DataRow r = dto.Rows[i];
 int id = Convert.ToInt32(r["ID"]);
            if (id == prodid)
            {
                dto.Rows.RemoveAt(i);
            }

}
0
 

Author Comment

by:Prysson
ID: 18886942
Works great! Thanks!
0
 

Author Comment

by:Prysson
ID: 18887075
Oops spoke too soon..

Having a bit of a problem with the code.

It onl;yworks if there is only one row int he table

If there are multiple rows in teh table for some reason it doesnt run the for loop..set the i variable and then just skips to the end..
I
0
 

Author Comment

by:Prysson
ID: 18887104
Ah never mind I figured it out

for(int i = dto.Rows.Count - 1; i == 0; i--)

needs to be

for(int i = dto.Rows.Count - 1; i >= 0; i--)

Otherwise it only runs if i is 0

Thanks again for the help...


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