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Why am I getting error disposing a couple of objects in the finally block of the try-catch?

Posted on 2014-12-25
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Last Modified: 2014-12-25
Hi, I'm using VS2012.
In my Gridview control's Rowupdaiting event, I declare a GridViewRow variable then i start the try-catch-finally blocks.  When I reference this GridViewRow variable and want to access the Dispose() method, the code got red underline that shows error when I hover over it, "Use of unassigned local variable..."

The variable is assigned a value and used inside of the try block.  Why am I getting this variable?  the scope looks fine to me and it's confusing with this error.  Thank you.
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Question by:lapucca
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11 Comments
 
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40518154
re:>  used inside of the try block

The scope is not fine. Have it before try.
0
 

Author Comment

by:lapucca
ID: 40518158
So, I have to have the assignment before the try block to be able to dispose it?  So it won't be able to catch error occur if assignment fail?
0
 
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40518161
You can declare it before bu instantiate it after try. If you want to post that portion of the code if you need help.

Here is sample
String temp;
try {
  temp = "Sample Text";
  // your code
}
catch {
  //instead
}
Finally
{
  temp="";
}

Open in new window

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Author Comment

by:lapucca
ID: 40518164
That's exactly what I did.  That's why it's mind boggling for me why it even complaint that I do assignment outside of the try block.  That is the same thing you're doing in your code example.  I declare above of the try block.  I then assign inside the try block...  It then gave error, red underline.
0
 

Author Comment

by:lapucca
ID: 40518165
Correction, I meant to say that I do assignment to the variable "inside of the try block"
0
 
LVL 34

Accepted Solution

by:
Mike Eghtebas earned 2000 total points
ID: 40518170
I know your variable is not string but doing the following may make some difference in this case:

String temp="";   //intiallization
try {
0
 

Author Comment

by:lapucca
ID: 40518172
GridViewRow and UserPrincipal.  The only thing I can assign to during declaration is null.  Tried that and it worked.  Pretty annoying that it can't just accept a declaration without assignment.  
Thank you.
0
 
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40518173
Please consider using something similar to this for now:
      private void Form1_Load(object sender, EventArgs e)
        {
            DataGridView dgv = DataGridView();
            try
            {
                dgv = new DataGridView();
                dgv.Name = "dataGridView1";
            }
            catch (Exception ex)
            {

            }
            finally 
            {
                dgv.Dispose();
            }
       
        }

        private DataGridView DataGridView()
        {
            throw new NotImplementedException();
        }

Open in new window


I will work to get rid of:
 private DataGridView DataGridView()
        {
            throw new NotImplementedException();
        }
0
 

Author Comment

by:lapucca
ID: 40518178
That's fine, it worked with null assignment.  Thank you.

I need help with the DAte/time column.  It's too hard with template field to find a use a regular expression that would validate date./time format.  And it's too complicated for users.  I think I need to find a way to pop up a calendar that allow users to enter date and time for that column in Gridview control.  This is the last thing that I need to do for this application.
0
 
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40518180
Well, popup candler will look impressive. I will start working at it shortly.
0
 

Author Comment

by:lapucca
ID: 40518184
Thank you very much!  You can answer to that other question where you were helping me with formatting the output of the template field.
0

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