Question

I Loaded Data From Datatable to DatagridView which look like this:

SerialNumber1 | Quantity | Issued Quantity | Status  |
    00001     |     1    |                 |         |
    00002     |     2    |                 |         | 

I have this requirement which make me stuck .

I need to query The data data grid view records to verify if the loaded Serial Number is The Same as The Actual. (maybe by using linq – correct me if I’m incorrect)

Ex:

var dgviewData = from a in gdview1.AsEnumerable()
                 where a<string>("SerialNumber").tostring() == txtserial.text
                 select a;

if(a.Count() > 0 )
{
    // Update Status of SerialNumber 00001 to Ok 
}
else
{
   //Error Serial Not Exist on Gridview
}

If SerialNumbers on DGview is the same on the actual serial scanned , the status will be updated in runtime on datagridview row cell only.

Eg: DGview serial = 00001 —> actual unit scanned = 00001

SerialNumber1 | Quantity | Issued Quantity | Status  |
    00001     |     1    |        1        |   Ok    |
    00002     |     2    |                 |         |

Thanks in Regards….

Answer 1

Your LINQ query is a bit off, to get matching rows you should do:

string scannedNumber = txtserial.text;
var matchedRows = this.gdview1.Rows
    .Cast<DataGridViewRow>()
    .Where(r => scannedNumber.Equals(r.Cells[0].Value));

Then to update “Issued Quantity” (cell at index = 2) simply do:

foreach (var row in matchedRows)
{
    row.Cells[2].Value = 1;
}

Unless you want to increment that number, then use Int32.Parse / .TryParse.