how to update column use as ID Control without save null

Question

Hi Guys Salam I use gridview convert fields as template deal with specific table  generally i have dropdownlist as control id of other dropdownlist works good as ID but when we update its save null please slove this my problem thanks Code Source : SortExpression=First_Supervisor>  autopostback=True DataSourceID=SqlDataSource4 DataTextField=EmpName DataValueField=EmpName> ConnectionString=  SelectCommand=select EmpName from EmployeesBasic2 where job='Custodian_1'> > _______________________________________________________________________ DataSourceID=SqlDataSource43 DataTextField=ID_Number Width=110 DataValueField=ID_Number> ConnectionString=  SelectCommand=SELECT [ID_Number] FROM [EmployeesBasic2] WHERE ([EmpName] = @EmpName)> PropertyName=SelectedValue Type=String /> > Thanks

Naveen Bisht · Answer

it is saving null value due to it is unable to find dropdown value at row data bound action of grid view. i have suggest you url so you can understand how it is working. if we take any control inside grid view we need to get value of that on row data command or event where you want now i am sharing you same example you are looking pls have a look http://www.c-sharpcorner.com/UploadFile/20abe2/get-row-cell-value-from-grid-view-of-checked-checkbox-in-asp/

Abdalla Elawad · Answer

Thank you Naveen Bisht This is good link but my problem doesn't solve why save Null Value ?

Naveen Bisht · Answer

you need to set and get dropdown value at row data item command. below links will help you better regarding same. http://www.aspdotnet-suresh.com/2012/05/aspnet-gridview-examples-and-samples-in.html