Question

With the help of string.join, we can split a comma-separated list of values.

string.join(",", array)

Can I do the same for a CheckboxList data source?
I have a DataValueField for this and need a comma-separated values without doing iteration.

Answer 1

Yes, in Fx4 there is an overload of String.Join() that takes an IEnumerable<string>.

But it depends on what the DataSource property actually points to, roughly:

string line = string.Join(",",  ComboBox1.DataSource.Select(x => x.Name) );

You may need a different lambda, and some typecasting of DataSource.

Edit:

var data = (List<MyClass>) (ComboBox1.DataSource);
string line = string.Join(",",  data.Select(x => x.Name) );