I am not get sum of gridview column. Of values

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int sum = 0;
          for (int i=0 ; i < dataGridView1.Rows.Count; ++i)
          {
              sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[3]);
          }

          MessageBox.Show(sum.ToString());

What I have tried:

int sum = 0;
          for (int i=0 ; i < dataGridView1.Rows.Count; ++i)
          {
              sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[3].Value);
          }

          MessageBox.Show(sum.ToString());

Posted 6-Mar-18 7:05am

2011999

Updated 6-Mar-18 10:21am

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cvogt61457 6-Mar-18 13:54pm

What value are you getting?
Are you sure your values are all numeric?
Do any values contain a decimal point?
Are you getting an exception instead?
Are you debugging the code and watching what is happening?

2011999 6-Mar-18 20:50pm

Numeric Values
all values are numeric
no decimal points
I got Exception
i Debug the code.i got Exception {"Object reference not set to an instance of an object."}

2 solutions

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cvogt61457 · Answer 1 · 2018-03-06T08:02:00

My first guess is that the values may contain non-numeric data.
Try this

double sum = 0;
for (int i=0 ; i < dataGridView1.Rows.Count; ++i)
{
    double value = 0.0;
    if (double.TryParse(dataGridView1.Rows[i].Cells[3].Value.ToString(), out value))
    {
        sum += value;
    }
}
MessageBox.Show(sum.ToString());

Maciej Los · Answer 2 · 2018-03-06T10:22:00

Solution 2

Check this:

C#

var result = dataGridView1.Rows.OfType<DataGridViewRow>()
    .Where(x=> x.Cells[3]!=null)
    .Sum();;
MessageBox.Show(result.ToString());

Posted 6-Mar-18 10:22am

Maciej Los