using (var ms = new MemoryStream())
                    {
                        if (ReportData.Tables.Count > 0)
                        {
                            DataSerializer.Serialize(ms, ReportData);
                           }
                    }

DataTable dtCloned = ReportData.Tables[0].Clone();
                    foreach (DataColumn column in dtCloned.Columns)
                    {
                        if (column.DataType == typeof(System.Object))
                            objectColumns.Add(column);
                    }
                    if (objectColumns.Count > 0)
                    {
                        foreach (DataColumn column in objectColumns)
                        {
                            column.DataType = typeof(System.String);
                        }
                    }
                    try
                    {
                        foreach (DataRow row in ReportData.Tables[0].Rows)
                        {
                            dtCloned.ImportRow(row);
                        }
                    }
                    catch (Exception ex)
                    {

                    }

<serviceDebug includeExceptionDetailInFaults="true" />