Calling ToString on Row yeilds incorrect values when DBNull is present

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When ToString is called on DBNull the microsoft implementation reads like so

public string ToString()
{
    return string.Empty;
}

If you try and call ToString on Row to say output the row to the string for values that contain DBNull you will get a "" output, this is clearly incorrect as this value is not the empty string but DBNull.

Can be fixed in FormatValue in Row by taking care of DBNull explicitly.