Question

Getting this error when running my code;

conversion from string 'DRAFT10' to type 'integer' is not valid

The code is referencing is this one;

Private Function RegistrationAllowed() As Boolean
Dim customerID As Integer = CInt(cboCustomers.SelectedValue)
Dim productCode As String = cboProducts.SelectedValue.ToString
If RegistrationDB.ProductRegistered(customerID, ProductCode) Then
MessageBox.Show("This product is already registered to the customer selected.", "Product Already Registered")
Return False
Else
Return True
End If
End Function

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Possible Causes :

• Here value from combobox cboCustomers.SelectedValue returning the string DRAFT10 and hence showing the error for conversion from string 'DRAFT10' to type 'integer' is not valid.
• If combobox is binded from the database then there are some properties like DisplayMember and ValueMember.
• DisplayMember is one that need to be displayed in the combobox
• ValueMember is one that need to get the value when the text is selected from combobox.

Solution :

• Check for the code MessageBox.Show(cboCustomers.SelectedValue) and see what is returning either the value or text.
• If string is returning then fix it.
• Also from the code it is observed that method ProductRegistered() expecting parameter of integer and string.

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.