[Solved] Concatenate a string for DisplayFor

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Add the strings that you want in a list, e.g.:

var str = New List<string>();
if (!string.IsNullOrEmpty(model.Address.ReferenceKey)) {
  str.Add(model.Address.ReferenceKey);
}

Then join the strings:

return string.Join(",", str);

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solved Concatenate a string for DisplayFor