DataGridView Exception

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Hello,

I have been trying to get the values from DataGridView. My stupid logic works a bit when accessing the individual cells of the Data Grid Row.
This is the the code that I am using.

C#

private void btn_fetch_Click(object sender, EventArgs e)
        {
            string result = "";
            string part1 = "";
            string part2 = "";

            for (int i = 1; i <= DGV_CsvFile.Rows.Count; i++)
            {
                part1 = DGV_CsvFile.Rows[i].Cells[0].Value.ToString();
                part2 = DGV_CsvFile.Rows[i].Cells[1].Value.ToString();
                result =result + part1+" : "+part2+"\n";
            }
                        
        }

But the problem comes when it completes its iteration, the following exception comes on my face. :(

"Object reference not set to an instance of an object."
and it selects the first line of the loop.

Need urgent help fellows.
Thanx in advance.

Posted 21-Jul-10 6:28am

farrukh.javeid

Updated 21-Jul-10 6:33am

Sandeep Mewara

v2

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Sandeep Mewara 21-Jul-10 12:33pm

Use PRE tags to format the code part. It makes the question readable.

3 solutions

Solution 1

Error is in this part of code:

C#

for (int i = 1; i <= DGV_CsvFile.Rows.Count; i++)            {                
   part1 = DGV_CsvFile.Rows[i].Cells[0].Value.ToString();                
   part2 = DGV_CsvFile.Rows[i].Cells[1].Value.ToString();                
   result =result + part1+" : "+part2+"\n";            
}

Well, indexing in the Datagrid rows start from zero (0) and not one.

If you have 5 rows, you are trying to access 1 to 5 instead it should be 0 to 4.

Make the following change:

C#

for (int i = 0; i < DGV_CsvFile.Rows.Count; i++)

i started from zero and the limiting condition is till rowCount.

Posted 21-Jul-10 6:35am

Sandeep Mewara

Updated 21-Jul-10 6:36am

v2

Solution 3

Thanks for quick responses but I have checked the loop while starting it like this

for (int i = 0; i < DGV_CsvFile.Rows.Count-1; i++)

as the last cell is null. In this case, the exception is removed but I cant get my results either.

Thanx for the responses.

Posted 21-Jul-10 6:48am

farrukh.javeid

Comments

Sandeep Mewara 21-Jul-10 13:41pm

Did you tried what I said? Copy paste it and try. Mark the answer accepted only once your issue resolves.

P.S. : Use comments feature to interact with answers.

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Abhinav S · Accepted Answer · 2010-07-21T06:37:00

Solution 2

Check if any of the values in the cells are null.
If they are you need to modify your code to check for null conditions before using ToString().

Posted 21-Jul-10 6:37am

Abhinav S