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    <p>1)Create a List of strings with all rows of column 'Consumable Name'. Fill with names.</p> <p>2)Create a List of integers equal to the number of items in the above List. Fill with quantities.</p> <p>3)Create a List of distinct strings from (1).</p> <p>4)Create a List of integers equal to the number of items in (3).</p> <p>5)Step into each distinct element and get the related matching 'Consumable Name' and add quantities.</p> <p>6)Similar steps you can follow if you wish to compare or check other columns.</p> <p>You can refer to the below code:</p> <pre><code> public void getQuantity() { List&lt;string&gt; consumbleNames = new List&lt;string&gt;(); List&lt;int&gt; quantity = new List&lt;int&gt;(); //Cells[5] refer to 6th column : Quantity issued: you can use column name too for (int i = 0; i &lt; yourDataGridView.Rows.Count; i++) { consumbleNames.Add(yourDataGridView.Rows[i].Cells[0].Value.ToString()); quantity.Add((int)Convert.ToInt32(yourDataGridView.Rows[i].Cells[5].Value.ToString())); } List&lt;string&gt; distinctNames = new List&lt;string&gt;(consumbleNames.Distinct()); List&lt;int&gt; quantityRelated = new List&lt;int&gt;(distinctNames.Count); for (int i = 0; i &lt; distinctNames.Count; i++) { quantityRelated.Add(new int()); for (int j = 0; j &lt; consumbleNames.Count; j++) { if (consumbleNames[j].Equals(distinctNames[i])) { quantityRelated[i] += quantity[j]; } } } foreach (int t in quantityRelated) { /* quantity corresponds to the each distinct item */ } } </code></pre>
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    1. POHow to Count the rows based on another Column in a DataGridView in C#
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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