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Message: <blockquote data-quote="Ranhiru" data-source="post: 4821281" data-attributes="member: 17748">Machan the first one is a problem because the column has a NULL value in it. Does the "Amount" column contain a null value??? If the "Amount" column contains NULL values, then it should be handled separately.And for the second problem i think Amount should work :SIf amount does not seem to work, simply use the column index <img src="/styles/default/xenforo/smilies/default/D.gif"  class="smilie" loading="lazy" alt=":D" title="Big grin    :D" data-shortname=":D" />So if the Amount column is the 3rd one, then the index is 2, because in C# its zero based indexes. [code]int i = 0;            int Total = 0;            for (i = 0; i < costDataGridView1.Rows.Count; i++)            {    if (costDataGridView1.Rows[i].Cells[2].Value != null)                        Total += Int32.Parse(costDataGridView1.Rows[i].Cells[2].Value.ToString());            }            this.textBox1.Text = Total.ToString();[/code] So this is perfectly all right too <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> Using the index instead of the name <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> Notice that now i check whether the value is not null. If Int32.Parse giving you any errors, try the Convert Class. Use Convert.ToInt32(whatever)...Hope this helps <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /></blockquote>

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