difference between two sentences

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Hi
I hope you can help me to know the difference between these two sentences

C#

something=((DataRowView)listBox1.SelectedItem).Row.ItemArray[0].ToString();

and

C#

something = listBox1.SelectedValue.ToString();

Posted 14-May-12 3:35am

TageTage

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3 solutions

Solution 1

((DataRowView)listBox1.SelectedItem).Row.ItemArray[0].ToString();
Is this even CORRECT? I doubt that.

Listbox's selected item would be of type ListItem. You are trying to cast it into DataRowView. There should be cannot cast expression error.

Second one looks ok - a valid code line.

Posted 14-May-12 4:10am

Sandeep Mewara

Comments

Shmuel Zang 14-May-12 10:33am

In addition to that, for avoiding NullReferenceException (on the second option), I would also check, if SelectedValue is null...

Solution 2

For the difference between SelectedValue and SelectedItem, you can read this link: http://bea.stollnitz.com/blog/?p=9

Posted 14-May-12 4:16am

Shmuel Zang

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woopsydoozy · Accepted Answer · 2012-05-14T05:11:00

Both your code lines are fine, assuming you've data bound to a dataview. The second line of code simply returns the "value" of the selected item (that is, whatever you've indicated as the ValueMember). The first reaches back into the data binding for your control, finds the row for the selected item, and returns the value in the first column--that value might or might not be the value or display member, depending on how you've coded it.