Thanks for your reply.  Here's an example where I am getting an exception
thrown.  I'm using version 1.6.1 of the DataMapper.

<update id="DynamicUpdate" parameterClass="Hashtable">
  update TestDB.dbo.Main set $Sets$ where [ID] = #Id#
</update>

public static void DoDynamicUpdate()
{
    Hashtable param = new Hashtable();
    param.Add("Sets", "[Data]=N'Fo?o'");
    param.Add("Id", 1);

    Mapper.Update( "DynamicUpdate", param );
}

The exception is

System.ArgumentOutOfRangeException: Specified argument was out of the range
of valid values.
Parameter name: index
   at
IBatisNet.DataMapper.Configuration.ParameterMapping.ParameterPropertyCollection.get_Item(Int32
index)
   at
IBatisNet.DataMapper.Configuration.Statements.PreparedStatementFactory.EvaluateParameterMap()
   at
IBatisNet.DataMapper.Configuration.Statements.PreparedStatementFactory.Prepare()
   at
IBatisNet.DataMapper.Configuration.Sql.SimpleDynamic.SimpleDynamicSql.BuildPreparedStatement(ISqlMapSessionsession,
RequestScope request, String sqlStatement)
   at
IBatisNet.DataMapper.Configuration.Sql.SimpleDynamic.SimpleDynamicSql.GetRequestScope(IMappedStatementmappedStatement,
Object parameterObject, ISqlMapSession session)
   at
IBatisNet.DataMapper.MappedStatements.MappedStatement.ExecuteUpdate(ISqlMapSession
session, Object parameterObject)
   at IBatisNet.DataMapper.SqlMapper.Update(String statementName, Object
parameterObject)
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