(I don’t understand ‘tyring to insert/update data’, ‘webcontrol is not associated with it’s property’!)
//
if you write code using parametrized query as
paramxxx.value = textbox1
it’ll show above error
to resolve it it should be
paramxxx.value =textbox1.text
//This kind of error message can occur when you are trying to insert/update data or any kind of operation which involves textbox/dropdownlist
The issue occurs if the webcontrol is not associated with its property
May be you have not associated the appropriate property of the control
i.e textBox1.Text
or dropdownlist1.SelectedItem.Value
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