System.NullReferenceException datagridview object reference not set to an instance of an object.

Question

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dataGridView.Rows[e.RowIndex].Cells["ReturnQty"].Value.ToString()

If the current cell value is null it shows the NullReferenceException error:
I want to do

C#

if(!String.IsNullOrEmpty(MainGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString()))
{

       // do sonmthing
}

Posted 17-Feb-11 23:13pm

sureshkumar.y

Updated 17-Feb-11 23:23pm

m@dhu

v3

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3 solutions

Solution 1

Try something like:

C#

if(MainGridView.Rows.Count >0 && MainGridView.Rows[e.RowIndex].Cells[e.ColumnIndex] != null)
{
   if(!String.IsNullOrEmpty(MainGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value))
   {
       // do sonmthind
   }
}

Posted 17-Feb-11 23:24pm

Sandeep Mewara

Comments

Sergey Alexandrovich Kryukov 18-Feb-11 12:06pm

All right, 5.
--SA

Solution 3

In addition to Sandeep's answer, I would add e.RowIndex >= 0 && e.ColumnIndex >= 0 inside if.
And IsNullOrEmpty only takes a string as parameter, but Cell.Value property is of type Object. So you can't pass it directly to the IsNullOrEmpty method.

Try th something like this:

C#

if (MainGridView.Rows.Count > 0 && e.RowIndex >= 0 && e.ColumnIndex >= 0)
{
   DataGridViewCell cell = MainGridView.Rows[e.RowIndex].Cells[e.ColumnIndex];
   if (cell != null && !String.IsNullOrEmpty(cell.Value as string))
   {
       // do something
   }
}

Posted 17-Feb-11 23:56pm

Olivier Levrey

Comments

Sergey Alexandrovich Kryukov 18-Feb-11 12:06pm

All right, 5.
--SA

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Ashishmau · Accepted Answer · 2011-02-17T23:28:00

Solution 2

Hi,

instead of using .tostring()
use Convert.tostring() as it handles null values
u can write like

if(Convert.Tostring(MainGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value)){       // do sonmthing}

Hope it helps..........
:-O

Posted 17-Feb-11 23:28pm

Ashishmau

Comments

Ashishmau 18-Feb-11 5:50am

Atleast Vote yaar,,if problem solves

Manas Bhardwaj 18-Feb-11 5:59am

have my 5...happy?

Member 10602680 2-Jun-14 5:52am

Thanx........It works

Sergey Alexandrovich Kryukov 18-Feb-11 12:06pm

All right, 5.
--SA

Member 8011155 12-Dec-11 3:46am

System.NullReferenceException: Object reference not set to an instance of an object.