Tag: ComboBox | MAKOLYTE

System.ArgumentException: Complex DataBinding accepts as a data source either an IList or an IListSource

08/02/2021 by Mak

If you try to set a list control’s DataSource to a type it can’t handle, then you’ll get the following exception: System.ArgumentException: Complex DataBinding accepts as a data source either an IList or an IListSource. (Parameter ‘value’)at System.Windows.Forms.ListControl.set_DataSource(Object value) Note: This applies to all controls that subclass ListControl, such as ComboBox and ListBox. This is … Read more

C# – Auto-populate a dropdown with enum values

10/16/202010/06/2020 by Mak

When you need to show enum values in a dropdown, it’s a good idea to automatically populate the list, instead of manually setting all of the values. To autopopulate the dropdown, set the DataSource to Enum.Values(), like this: Then to get the option the user picked, do the following: When I launch my form, I … Read more

ArgumentOutOfRangeException: InvalidArgument=Value of 0 is not valid for SelectedIndex

10/17/202009/19/2020 by Mak

Problem Let’s say you’re initializing a ComboBox like this: And you get the following exception: System.ArgumentOutOfRangeException: ‘InvalidArgument=Value of ‘0’ is not valid for ‘SelectedIndex’. (Parameter ‘value’)Actual value was 0.’ You’re getting this exception because the DataSource is empty. Solution Are you expecting there to always be data? If you’re expecting there to always be data, … Read more