Public Function GetChars( _
   ByVal i As Integer, _
   ByVal fieldoffset As Long, _
   ByVal buffer() As Char, _
   ByVal bufferoffset As Integer, _
   ByVal length As Integer _
) As Long

public long GetChars( 
   int i,
   long fieldoffset,
   char[] buffer,
   int bufferoffset,
   int length
)

string content = @"True, 129, f0a12b, a, string, ""a,b,c"", 1993-06-26 2:00pm, 0.25, {74A51B0C-21B1-42b4-BAE4-AE6480B8B8DB}, 20000, -2000000000, 2000000000000";
using (CsvReader r = new CsvReader(new StringReader(content), CsvOptions.None))
{
    int field = 0;
    byte[] buf = new byte[10];
    char[] ch = new char[10];

    Assert.IsTrue(r.Read());
    Assert.AreEqual(true, r.GetBoolean(field++));
    Assert.AreEqual((byte)129, r.GetByte(field++));

    Assert.AreEqual(3L, r.GetBytes(field++, 0, buf, 0, buf.Length));
    Assert.AreEqual((byte)0xf0, buf[0]);
    Assert.AreEqual((byte)0xa1, buf[1]);
    Assert.AreEqual((byte)0x2b, buf[2]);
    Assert.AreEqual((byte)0, buf[3]);

    Assert.AreEqual('a', r.GetChar(field++));

    Assert.AreEqual(6, r.GetChars(field++, 0, ch, 0, ch.Length));
    Assert.AreEqual("string", new String(ch, 0, 6));

    using (IDataReader c = r.GetData(field++))
    {
        Assert.AreEqual(1, c.Depth);
        Assert.AreEqual(0, c.FieldCount);
        Assert.IsTrue(c.Read());
        Assert.AreEqual(3, c.FieldCount);
        Assert.AreEqual("a", c.GetString(0));
        Assert.AreEqual("b", c.GetString(1));
        Assert.AreEqual("c", c.GetString(2));
    }

    Assert.AreEqual(DateTime.Parse("1993-06-26 2:00pm"), r.GetDateTime(field++));

    Assert.AreEqual((decimal)0.25, r.GetDecimal(field));
    Assert.AreEqual(0.25f, r.GetFloat(field));
    Assert.AreEqual(0.25, r.GetDouble(field++));

    Assert.AreEqual(new Guid("74A51B0C-21B1-42b4-BAE4-AE6480B8B8DB"), r.GetGuid(field++));

    Assert.AreEqual((short)20000, r.GetInt16(field++));
    Assert.AreEqual(-2000000000, r.GetInt32(field++));
    Assert.AreEqual(2000000000000L, r.GetInt64(field++));
}

Dim content As String = "True, 129, f0a12b, a, string, ""a,b,c"", 1993-06-26 2:00pm, 0.25, {74A51B0C-21B1-42b4-BAE4-AE6480B8B8DB}, 20000, -2000000000, 2000000000000"
Using r As New CsvReader(New StringReader(content), CsvOptions.None)
    Dim field As Integer = 0
    Dim buf As Byte() = New Byte(10) {}
    Dim ch As Char() = New Char(10) {}

    Assert.IsTrue(r.Read())
    Assert.AreEqual(True, r.GetBoolean(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))
    Assert.AreEqual(DirectCast(129, Byte), r.GetByte(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))

    Assert.AreEqual(3L, r.GetBytes(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1), 0, buf, 0, buf.Length))
    Assert.AreEqual(DirectCast(&Hf0, Byte), buf(0))
    Assert.AreEqual(DirectCast(&Ha1, Byte), buf(1))
    Assert.AreEqual(DirectCast(&H2b, Byte), buf(2))
    Assert.AreEqual(DirectCast(0, Byte), buf(3))

    Assert.AreEqual("a"C, r.GetChar(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))

    Assert.AreEqual(6, r.GetChars(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1), 0, ch, 0, ch.Length))
    Assert.AreEqual("string", New [String](ch, 0, 6))

    Using c As IDataReader = r.GetData(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1))
        Assert.AreEqual(1, c.Depth)
        Assert.AreEqual(0, c.FieldCount)
        Assert.IsTrue(c.Read())
        Assert.AreEqual(3, c.FieldCount)
        Assert.AreEqual("a", c.GetString(0))
        Assert.AreEqual("b", c.GetString(1))
        Assert.AreEqual("c", c.GetString(2))
    End Using

    Assert.AreEqual(DateTime.Parse("1993-06-26 2:00pm"), r.GetDateTime(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))

    Assert.AreEqual(DirectCast(0.25, Decimal), r.GetDecimal(field))
    Assert.AreEqual(0.25F, r.GetFloat(field))
    Assert.AreEqual(0.25, r.GetDouble(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))

    Assert.AreEqual(New Guid("74A51B0C-21B1-42b4-BAE4-AE6480B8B8DB"), r.GetGuid(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))

    Assert.AreEqual(DirectCast(20000, Short), r.GetInt16(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))
    Assert.AreEqual(-2000000000, r.GetInt32(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))
    Assert.AreEqual(2000000000000L, r.GetInt64(System.Math.Max(System.Threading.Interlocked.Increment(field),field - 1)))
End Using