Gridview Creation using add and delete button for the records

I have a requirement for my website


my gridview must  have  4 headers
header1 header2 header3 ADDBUTTON(header 4 )

the gridview must have  6 columns

column1 : this column is a dropdownlist which has a sqldatasource as its data source from a table


column2 : this value is a label (comes from the postback of the dropdownlist,depending up on the tem selected in ddl)(non editable)

column3: this value also comes from the post back event of the dropdown list(quantity)((editable textbox))

column4: this value  also comes from the post back of event dropdownlist (price)((editable textbox))

column5 : this is a lebel dynamically generated by multiplying the vallues of column3 and column4 (non editale)

this column 5 must change whenever column 3 or column4 changes


column6: this has a delete button which deletes the present row

Now coming to my requirement

intially when the user comes to the page

the user must see the gridview with only 1 row

when the user clicks the addrow button on the gridview(header 4)

a new row (with the columns as specified above) must be inserted


Im in need of any links/solutions/suggestions/tutorial to get this issue

Really appreciate any help
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