An extension method to convert a List of any type to a DataTable.

ToDataTable

public static DataTable ToDataTable<T>(this List<T> input)
{
    var props = TypeDescriptor.GetProperties(typeof(T));
    var output = new DataTable();

    foreach(PropertyDescriptor item in props)
    {
        if (item.PropertyType.IsGenericType && item.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
            output.Columns.Add(item.Name, item.PropertyType.GetGenericArguments()[0]);
        else
            output.Columns.Add(item.Name, item.PropertyType);
    }

    var values = new object[props.Count];
    foreach (T item in input)
    {
        for (int i = 0; i < values.Length; i++)
        {
            values[i] = props[i].GetValue(item);
        }
        output.Rows.Add(values);
    }
    return output;
}