Convert CSV file or Excel spreadsheet to RESX File

namespace SampleResourceImport
{
    class Program
    {
        static void Main(string[] args)
        {

            XmlDocument doc = new XmlDocument();
            string filePath = @"[file path to your resx file]";
            doc.Load(filePath);
            XmlElement root = doc.DocumentElement;

            XmlElement datum = null;
            XmlElement value = null;
            XmlAttribute datumName = null;
            XmlAttribute datumSpace = doc.CreateAttribute("xml:space");
            datumSpace.Value = "preserve";

            // The following mocks the actual retrieval of your localized text
            // from a CSV or ?? document...
            // CSV parsers are common enough that it shouldn't be too difficult
            // to find one if that's the direction you go.
            Dictionary<string, string> d = new Dictionary<string, string>();
            d.Add("Label1", "First Name");
            d.Add("Label2", "Last Name");
            d.Add("Label3", "Date of Birth");

            foreach (KeyValuePair<string, string> pair in d)
            {
                datum = doc.CreateElement("data");
                datumName = doc.CreateAttribute("name");
                datumName.Value = pair.Key;
                value = doc.CreateElement("value");
                value.InnerText = pair.Value;

                datum.Attributes.Append(datumName);
                datum.Attributes.Append(datumSpace);
                datum.AppendChild(value);
                root.AppendChild(datum);
            }

            doc.Save(filePath);
        }
    }
}