howt to remove rows in gridview using datatable in asp.net

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C#

Value for course Fees & Time spent by student Dropdownlist1(Good,Fair,Poor)

if the user select the poor from the Drodpdownlist1 that time only the popupscreen is to be displayed.

The popupscreen as follows

Negative_Feed_Back
textbox1(Type reason for poor)
OK (Button)


When User clicks OK Button selected Dropdownlist1 and reason for poor is display gridview.

Gridview as follows

Dropdown Remarks

0 Not Good


The user want to select the Good BUT wrongly select the Poor from the Dropdownlist1 that time popup screen is display and give the reason and click OK Button.

Gridview as follows

Dropdown Remarks

0 Not Good

Again user want to change and select Good from the Dropdownlist1.

Ouput i want in gridview as follows

Dropdown Remarks (Empty One)