Convert values from Access Combo Box to string - ms-access

Question

I need to convert the values from combo box to a string so I can add that string to a variable, to a function to eventually add to a database.
Here is my sub that grabs text from my form and from the combo box:
Private Sub cbRowStudentGrade_Change()
Course_ID.SetFocus
rowCourseID = Course_ID.Text
StuRed_ID.SetFocus
rowStudentRedID = StuRed_ID.Text
cbRowStudentGrade.SetFocus
cbRowStudentGrade = cbRowStudentGrade.Column(0)
CurrentDb.Execute "qryInputGrades"
MsgBox (rowCourseID)
MsgBox (rowStudentRedID)
MsgBox (cbRowStudentGrade)
Requery
Repaint
End Sub
And here are the functions that I am using as criteria in my Access query builder.
Public Function funcRowCourseID() As String
funcRowCourseID = rowCourseID
End Function
Public Function funcRowStudentRedID() As String
funcRowStudentRedID = rowStudentRedID
End Function
Public Function funcCbRowStudentGrade() As String
funcCbRowStudentGrade = cbRowStudentGrade
End Function
My query:
INSERT INTO tblRegistrationGrade ( Red_ID, Course_ID, Grade )
VALUES (funcRowStudentRedID(), funcRowCourseID(), funcCbRowStudentGrade());
I think there is a datatype mismatch between the database and what the combobox value actually is. But, if there were a datatype mismatch wouldn't there be an error stating as such? My database requires short text, which these are.

Answer 1

You're doing this way too complicated.
You can directly refer from your INSERT query to the form controls:
INSERT INTO tblRegistrationGrade ( Red_ID, Course_ID, Grade )
VALUES (Forms!myForm!StuRed_ID, Forms!myForm!Course_ID, Forms!myForm!cbRowStudentGrade);
and get rid of almost all of the code, except calling the query.
As John wrote, it would be better placed in cbRowStudentGrade_AfterUpdate().
Or, instead of the INSERT query, use a DAO.Recordset with AddNew, see:
How to: Add a Record to a DAO Recordset
There you can also directly use the values from your from controls without worrying about data types.