object reference not set to an instance of an object - when gridview has paging?

Question

User2091173246 posted

Hi,

I have a gridview with paging option

protected void gwActivity_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gwActivity.PageIndex = e.NewPageIndex;
BindGridviewActivity();

}

I rebound the gridview when a new page is set.

however there is an issue with Rowcommand when paging.

protected void gwActivity_RowCommand(object sender, GridViewCommandEventArgs e)
{

{

GridViewRow row = ((e.CommandSource as Control).NamingContainer as GridViewRow);
txtActivity.Text = row.Cells[2].Text;
ddlStatus.SelectedValue = row.Cells[4].Text;}

}

object reference not set to an instance of an object

i do not know what to do here?

THIS HAS BEEN SOLVED!

Answer 1

User-1724331924 posted

Hi Skwizzy,

From your post, it is not clear that in which line/section the exception happens.

But I can say you that this exception happens due to "null reference" which means, "row" can be null and trying to access the same.

Try the following way to get row:

int index = Convert.ToInt32(e.CommandArgument);

// Retrieve the row that contains the button clicked 
// by the user from the Rows collection.
GridViewRow row = gwActivity.Rows[index];

If the exception happens for another object, please let us know.

Thanks,

aNu

Answer 2

User2091173246 posted

Hi, Sorry, the exection happend on:

row.Cells[2].Text = 'row.Cells[2].Text' threw an exception of type 'System.NullReferenceException'

However your example work BUT when i press "SELECT" in my gridview i gett an error:

Index was out of range. Must be non-negative and less than the size of the collection.

The only one that works is INDEX: 1 ? but i have like 20+ rows and there will be more in my gridview

Answer 3

User-1838255255 posted

Hi Skwizzy,

According to your description, as far as i know, this issue maybe caused by the can not get the row or the cells in the row is null, i suggest you add a break point to check the row and cells value, you could check this tutorial about how to debug code:

https://msdn.microsoft.com/en-us/library/5557y8b4.aspx 

Best Regards,

Eric Du