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POHow to multiply data of two columns for third column in datagridview
 

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  1. POHow to multiply data of two columns for third column in datagridview
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    <p>I want to multiply the data of two columns and show it in the third column.</p> <p>For example:</p> <pre><code>1st Column: Quantity 2nd Column: Rate 3rd Column: Price </code></pre> <p>I want to multiply as user enters the data for quantity and rate like <code>Quantity=2</code>, <code>rate=50</code>automatically in price column I want <code>100</code> to be appear.</p> <p>Simultaneously I want to division as user enters the data for quantity and rate like <code>Price=100</code>, <code>rate=50</code>automatically in Quantity column I want <code>2</code> to be appear.</p> <p>And when a user enters the data for quantity and rate like <code>Price=100</code>, <code>Quantity=2</code>automatically in Rate column I want <code>50</code> to be appear.</p> <p>This three will happen in a same datagridview. User only enter any two field within this three and third will come automatically.</p> <p>Using C#, VS2008, SQL 2008</p> <pre><code>private void dataGridView2_CellEndEdit(object sender, DataGridViewCellEventArgs e) { int quantity,rate; for (int i = 0; i &lt; dataGridView2.Rows.Count; i++) { if(int.TryParse(dataGridView2.Rows[i].Cells[1].Value.ToString(), out quantity) &amp;&amp; int.TryParse(dataGridView2.Rows[i].Cells[2].Value.ToString(), out rate)) { int price = quantity * rate; dataGridView2.Rows[i].Cells[3].Value = price.ToString(); } } } </code></pre> <p>I write this code. There shows a error. Object reference not set to an instance of an object on </p> <pre><code>if(int.TryParse(dataGridView2.Rows[i].Cells[1].Value.ToString(), out quantity) &amp;&amp; int.TryParse(dataGridView2.Rows[i].Cells[2].Value.ToString(), out rate)) </code></pre> <p>this line.</p> <hr> <p><img src="https://i.stack.imgur.com/6lZZy.jpg" alt="enter image description here"></p> <p>I want to do like this. User can fill any 2 field among this 3. And third will take automatically. </p>
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    1. USAnimesh Ghosh
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    1. COWhat if the `rate` and `quantity` are already `50` and `2` respectively but user enters `150` into the `Price`? How do we update the other 2 columns? Update `rate` and `quantity` as `50` and `3` respectively or `3` and `50` respectively? or `15` and `10` respectively? Your problem is in fact a little unclear. In context of `Binding`, that even becomes more complex.
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      1. USKing King
 

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