How do I multiply datagridview column values with a text box value.

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The Code is working fine if i generate some rows and then i input Text box Value ............. but first if i input Text box value and then generate rows. It do not perform action and the total value shows in totPenTxt.Text zero.

What I have tried:

private void penTxt_TextChanged(object sender, EventArgs e)
       {
           int sum = 0;
           for (int i = 0; i < metroGrid1.Rows.Count - 1; ++i)
           {
               sum += Convert.ToInt32(metroGrid1.Rows[i].Cells["quantity"].Value);
           }
           if (penTxt.Text == string.Empty && totPenTxt.Text != string.Empty)
           {
               totPenTxt.Text = Convert.ToInt32(0).ToString();
           }
           else
           {
               int value = Convert.ToInt32(penTxt.Text);

                   int result = value * sum;
                   totPenTxt.Text = result.ToString();

           }

Posted 4-Jan-18 4:31am

Member 13510001

Updated 4-Jan-18 4:45am

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Richard MacCutchan · Answer 1 · 2018-01-04T04:45:00

Solution 1

If there are no rows in the GridView then sum will be zero. You need to add a proper check for the number of rows and take a different action if there are none.

Also ...

C#

        totPenTxt.Text = Convert.ToInt32(0).ToString();
// why not just:
        totPenTxt.Text = "0";

Posted 4-Jan-18 4:45am

Richard MacCutchan

Comments

Member 13510001 4-Jan-18 11:28am

Dear thank u for helping me out can you please elaborate what should i do in this scenario if user First input textBox value and then he generates the rows as many as he wants. as user generate a row totPenTxt.text changes it value according to rows count.

Richard MacCutchan 5-Jan-18 4:22am

You just need to check if there are any rows at the beginning of the penTxt_TextChanged method. If the row count is zero then return from the method immediately.