checking if data in datagridview equal to data in datatable

Before binding data to the gridview, take the dataset copy into another dataset. Now add a new column to the dataset data table which flags if there are changes to the row. Place this dataset in a session variable. Now bind the gridview with the first dataset.

Whenever you do any changes, flag the appropriate row as changed in the new column that you have added in the dataset in the session variable. After the changes commit the changes to dataset and again assign the dataset to the same session variable.

Whenever you want to find out if there are any changes, query the datatable in the session variable dataset to find if any of the row has the flag column set to some value.

Let me know if you have questions on the same.