public static void ToVarChar_True()
{
var value = Field.BooleanTrue;
var v = value.AsVarChar();
Assert.IsNotNull(v);
Assert.IsInstanceOf<StringType>(v.Type);
Assert.AreEqual(SqlTypeCode.VarChar, v.Type.TypeCode);
Assert.IsInstanceOf<SqlString>(v.Value);
var s = (SqlString) v.Value;
Assert.AreEqual("true", s.Value);
}