datagridview column multiplication and then sum of these

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hello,
i want two multiply two column's value one by one and then print the sum of these multiplied answers in a text box. i have written a code but it gives out of range error.the code is this:

d = 0

For r = 0 To a - 1
c = (DataGridView1.Item(j + 3, r + 1).value * DataGridView1.Item(j + 2, r + 1).value)
d = d + c
Next r
TextBox2.Text = Str(d)

here "r" are rows and "a" is total no.of rows given by user."j" are columns

kindly reply me as soon as possible i need this urgently.

Posted 6-Jun-12 18:59pm

Afsa Latif

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vakativamsi · Answer 1 · 2012-06-06T19:50:00

Hi

I Think This code is helpful you

VB

Double val1 = Convert.ToDouble(dataGridView1.Rows[e.RowIndex].Cells[4].Value);
                Double val2 = Convert.ToDouble(dataGridView1.Rows[e.RowIndex].Cells[6].Value);
                dataGridView1.Rows[e.RowIndex].Cells[7].Value = val1 * val2;
                //val3 = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[8].Value);
                //tb_grossamt.Text = (val1 * val2).ToString();
                Double valgrd = (val1 * val2);
                Double valtax = Convert.ToDouble(tb_tax.Text);
                Double taxtot = (valgrd * valtax / 100);
                Double ftot = (valgrd + taxtot);

VJ Reddy · Answer 2 · 2012-06-06T20:32:00

The reason for getting the out of range error may be because the DataGridView Rows collection is zero based whereas in the following code

VB

c = (DataGridView1.Item(j + 3, r + 1).value * DataGridView1.Item(j + 2, r + 1).value)

r+1 for upper bound value of the loop makes Row index as a which causes the above error.

So replace r+1 with r in the above code further it is better to convert the value to Double for multiplication as already suggested in Solution 1, as shown below:

VB

c = Convert.ToDouble(DataGridView1.Item(j + 3, r + 1).value) * Convert.ToDouble(DataGridView1.Item(j + 2, r + 1).value)