Subtract ASP.Net GridView rows and show result using C# and VB.Net

mansoork...

I have gridview with user task details loading from sql table and there is start time and end time is there.

i have to subtract first row end time and second row start time and show the result in-between that rows my gridview.

mansoork...

0 3

How to show the this label as a new row in between that rows in gridview, now its coming column wise.

<asp:Label ID="lblDiff" runat="server" Text="0" />

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