Set selected value of a lot of combo

[Filleau]

Hi

I have 8 combobox on my form.
I have to set for each of them the selected value (Radcombo.Selectedvalue="Text")

In some case the value does not exist in the combobox, so I need to set the combo.selectedvalue to nothing

Do do this I use a "Try-Catch as Exception" for each combo ! As you know Try-Catch is not good for performances.

Here my code

Try
  Zlocaledit.SelectedValue = Zlocal.Text
Catch ex As Exception
  Zlocaledit.SelectedIndex = Nothing
End Try

Try
  ZServiceEdit.SelectedValue = Zservice.Text
Catch ex As Exception
  ZServiceEdit.SelectedIndex = Nothing
End Try

Try
  ZSocedit.SelectedValue = ZSoc.Text
Catch ex As Exception
  ZSocedit.SelectedIndex = Nothing
End Try

Etc etc etc

Is there another way to do this ? (Without a Try-Catch)

Thanks all

[Rosi]

Hello Filleau,

There is no need to use try-catch-block.

If the value that you set does not exist the SelectedIndex of the RadComboBox will be set automatically to 0(or -1 if the AllowCustomText property of RadCombobox is enabled)

Note that the SelectedIndex property cannot be set to Nothning.Its default value is 0 for readonly mode and -1 when AllowCustomText property is set to true.

Regards,
Rosi
the Telerik team

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[Filleau]

Tested and approved !
Thanks

[Paul]

i am having a problem with setting the value of the radcombobox, not too dissimilar to this problem. On page load when i assign the combo box to a value which doesnt exist in the combo box it doesnt throw any errors, although when i used the same code to assign the combo box to the same value elsewhere its does throw an error stating that the 'Specified argument was out of the range of values'.

Here's the code i use:

cboUNUMBER.SelectedValue = .UNUMBER

 

Any ideas why this is happening ? i can fix the problem but need to know why its throwing an error in one instance and not another

[Simon]

Hello Paul,

Is the ComboBox data bound in the cases the error appears? If this is true, try calling cboUNUMBER.ClearSlection() before setting the selected value in these cases.

Best wishes,
Simon
the Telerik team

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[Paul]

Hi,
The combo box is bound in both instances where the error occurs and does not occur. That did not appear to fix the problem, however we do already have a solution to the problem as follows:

If cboUNUMBER.FindItemByValue(.UNUMBER) Is Nothing Then
     cboUNUMBER.SelectedIndex = 0
Else
    cboUNUMBER.SelectedValue = .UNUMBER
    cboUNUMBER.FindItemByValue(.UNUMBER).Selected = True
End If

We are more interested in why such an error would occur in the first place and if it can be resolved by a simplier measure so we know how to identify such an error in the future and the best way to solve the problem.

 

 

[Simon]

Hello Paul,

Generally, this error appears if there is a selected Item in the ComboBox and then the ComboBox is bound to a data source which does not contain the selected Item.

In your case, the cause of the error may be different but without looking at your code I will be unable to pinpoint it.

Please open a formal support ticket and send us the page there for additional inspection.

Best wishes,
Simon
the Telerik team

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