Create a Total Column in ASP.NET Gridview

In this code snippet I am sharing how we can add a column dynamically in gridview which will hold the sum of first two columns.

Suppose I have two columns which I am representing with in-memory objects(in reality we can fetch these from database or XML file etc.) These columns are holded by custom type like this:-

public class Test
{
 public int TestId1 { get; set; }
 public int TestId2 { get; set; }
}

Now, what we want in the gridview is that these two columns should be displayed & third column should be generated which will be sum of these two columns.

We can do calculation in Gridview using inline databinding syntax, like this:-

<asp:GridView ID="grdTest" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField HeaderText="ID1" DataField="TestId1" />
                <asp:BoundField HeaderText="ID1" DataField="TestId2" />
                <asp:TemplateField HeaderText="Result">
                    <ItemTemplate>
                        <%# (Convert.ToInt32(Eval("TestId1")) * Convert.ToInt32(Eval("TestId2")))%>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

Finally here is the code to bind this gridview:-

private void BindGrid()
        {
            List<Test> testDate = new List<Test>
            {
                new Test { TestId1 = 1, TestId2 = 2 },
                new Test { TestId1 = 2, TestId2 = 4 },
                new Test { TestId1 = 3, TestId2 = 6 }
            };
            grdTest.DataSource = testDate;
            grdTest.DataBind();
        }

Happy Coding :)