Help! Dim RegionID As Integer = Convert.ToInt32

[andyjkh25]

If cboRegion.SelectedValue.ToString() <> "" Then
' Dim cboRegion As String = String.Empty
Dim RegionID As Integer = Convert.ToInt32(cboRegion.SelectedValue.ToString())
LoadProvince(RegionID)
cboCity.SelectedIndex = 0

End If

Need some Help, said, input String was not in a correct Format

[si_the_geek]

Welcome to VBForums

That code is attempting to convert the value in cboRegion.SelectedValue.ToString() to an Integer, but the error indicates that isn't possible.

To find out why you should check what the actual value of cboRegion.SelectedValue.ToString() is, as it might be completely different to what you expect... and if you can't work out what is wrong, tell us what the value is and we can work it out.

Once you know what the issue is you can alter your code to cope with it. One possible solution (which is not appropriate for all situations) is to use TryParse instead of Convert, eg:

Dim RegionID As Integer
If Int32.TryParse(cboRegion.SelectedValue.ToString(), RegionID) Then
  LoadProvince(RegionID)
  cboCity.SelectedIndex = 0
End If

This doesn't make it more likely to convert the value, but it does mean that no error message will be displayed if it can't be converted.

[Shaggy Hiker]

This:

cboRegion.SelectedValue.ToString()

is not returning what you think it is returning. Depending on how you set up cboRegion, you may be getting back a type name rather than the value you expect. Put a breakpoint on the line that causes the exception (or just let it fail), and look at what that .ToString is returning....you'll be surprised.

[jmcilhinney]

If you're using SelectedValue then you should have assigned the name of a property to the ValueMember. What is the data type of that property?