Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound.

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VS2008

C#

Visual-Studio

, +

I have a grid and when data is loaded in grid; I simply select a row and press edit button. On edit, new sub form is opened and values of row's cells are passed to controls on sub form. But, when I change some values on sub form and save them to be replaces in grid the error comes to me: Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound. What is cause of this error and how to overcome this.