Object reference not set to an instance of an object.

[Guest]

Hello all, can someone please be my second pair of eyes! I'm getting the
above error at line: for(int i = 0; i <= dlstScope.Items.Count-1; i++).

My code's below: (dlstScope is a nested dlstScope in a repeater). Thanks all.

private void butSave_Click(object sender, System.EventArgs e)
{
DataList dlstScope = (DataList)myRepeater.FindControl("dlstScope");

for(int i = 0; i <= dlstScope.Items.Count-1; i++)
{
string Answer =
((DropDownList)dlstScope.Items.FindControl("txtAnswer")).SelectedValue;
string WorksheetQuestionID =
((Literal)dlstScope.Items.FindControl("lblWorksheetQuestionID")).Text;
string WorksheetID =
((Literal)dlstScope.Items.FindControl("lblWorksheetID")).Text;
Action(WorksheetQuestionID, Convert.ToInt32(WorksheetID),
Convert.ToInt32(Answer));
}
}

 

[Karl Seguin]

Jon,
Seems pretty straightforward with the information you've provided.
dlstScope is null, which means myRepeater.FindControl("dlstScope") didn't
return a value.

As you say, dlstScope is nested within the repeater, presumably the
ItemTemplate. If this is so, dlstScope isn't a child of myRepeater and thus
won't be found (as you are seeing). Instead, dlstScope is a child of an
Item of myRepeater..such as myRepeater.Items[0].FindControl("dlstScope")

What I can't tell you is which Item you want...you might want to loop
through all of them (in which case you'll have multiple dlstScope) or you
might want a particular one..but from the provided code I can't say which or
how to do it.

Hope this helps,
karl

 

[Matt Berther]

Hello Jon,

Clearly the problem is that dlstScope is null. Make sure that you've set
the id properly in the repeater template.

 

[obeOnline]

Is there somewhere that you are using the "new" keyword on dlstScope?
You have to create a new instance of dlstScope at some point.

 

[Guest]

Karl, thats' great! You pointed me in the right direction. This is the code
that worked: Thanks again.

private void butSave_Click(object sender, System.EventArgs e)
{
for(int j = 0; j <= myRepeater.Items.Count-1; j++)
{
DataList dlstScope =
(DataList)myRepeater.Items[j].FindControl("dlstScope");

for(int i = 0; i <= dlstScope.Items.Count-1; i++)
{
string Answer =
((DropDownList)dlstScope.Items.FindControl("txtAnswer")).SelectedValue;
string WorksheetQuestionID =
((Literal)dlstScope.Items.FindControl("lblWorksheetQuestionID")).Text;
string WorksheetID =
((Literal)dlstScope.Items.FindControl("lblWorksheetID")).Text;
Action(WorksheetQuestionID, Convert.ToInt32(WorksheetID),
Convert.ToInt32(Answer));
}
}

Jon,
Seems pretty straightforward with the information you've provided.
dlstScope is null, which means myRepeater.FindControl("dlstScope") didn't
return a value.

As you say, dlstScope is nested within the repeater, presumably the
ItemTemplate. If this is so, dlstScope isn't a child of myRepeater and thus
won't be found (as you are seeing). Instead, dlstScope is a child of an
Item of myRepeater..such as myRepeater.Items[0].FindControl("dlstScope")

What I can't tell you is which Item you want...you might want to loop
through all of them (in which case you'll have multiple dlstScope) or you
might want a particular one..but from the provided code I can't say which or
how to do it.

Hope this helps,
karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

Hello all, can someone please be my second pair of eyes! I'm getting the
above error at line: for(int i = 0; i <= dlstScope.Items.Count-1; i++).

My code's below: (dlstScope is a nested dlstScope in a repeater). Thanks all.

private void butSave_Click(object sender, System.EventArgs e)
{
DataList dlstScope = (DataList)myRepeater.FindControl("dlstScope");

for(int i = 0; i <= dlstScope.Items.Count-1; i++)
{
string Answer =
((DropDownList)dlstScope.Items.FindControl("txtAnswer")).SelectedValue;
string WorksheetQuestionID =
((Literal)dlstScope.Items.FindControl("lblWorksheetQuestionID")).Text;
string WorksheetID =
((Literal)dlstScope.Items.FindControl("lblWorksheetID")).Text;
Action(WorksheetQuestionID, Convert.ToInt32(WorksheetID),
Convert.ToInt32(Answer));
}
}