how to link textbox value with its database field id

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I am trying to store the textbox value by its database field.. I have a combo box with student numbers that, when selected-loads the corridor name and residence name of that selected student into text boxes.

when i call the insert method

bo.AddEquipmentToStoreRoom(Convert.ToDateTime(lblDate.Text), Convert.ToDateTime(lblTime.Text), option1, txtStoreBarcode.Text, Convert.ToInt32(txtCorridorName.Text), Convert.ToString(cmbStudentNumber.SelectedValue), Convert.ToInt32(cmbDescription.SelectedValue));

it returns an error message saying "input string was not in a correct format"... Please help. Thanks.

Posted 16-Sep-13 21:33pm

zikhona nkebe

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TrushnaK 17-Sep-13 3:53am

Debuge and Check values in this line:-
Convert.ToInt32(txtCorridorName.Text), Convert.ToString(cmbStudentNumber.SelectedValue),

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V.Lorz · Answer 1 · 2013-09-16T21:49:00

When facing problems like this, the debugger is probably the best tool you'll have at your hands.

1) Put one breakpoint at the sentence where the exception is thrown.
2) Let the code run until your breakpoint is hit.
3) Use the quick watch debug view to evaluate each expression involved in the sentence,
4) After determining the piece of code that fails, correct it
5) Test the code again and repeat from step 2) if needed.

In your case, most surely the problem is caused by some malformed string passed as parameter to one of the Convert method calls in your code. You'll have to check them all individually.

Perhaps you should consider adding some sort of input validation mechanism in our code.