public void UpdateLeadHEiService()
        {
            //Creating an Instance of SIS Connector iService
            SISConnectorWebService SISService = new SISConnectorWebService();

            //Setting the suppress message flag to true.
            SISService.SuppressMsgValue = new SuppressMsg();
            SISService.SuppressMsgValue.SuppressMsgFlag = true;

            //Generating the Username Token Information
            UsernameToken userToken = getUserToken("ParkerRoy", "password");

            //Associating the Username Token Information with the SIS Connector iService Instance
            SISService.RequestSoapContext.Security.Tokens.Add(userToken);
            SISService.RequireMtom = false;

            //Creating ObjectInformation Instance
            ObjectInformation objectData = new ObjectInformation();
            objectData.ObjectType = 20005; // Object type of Lead Object
            objectData.InstanceId = 76;    // Setting instance ID to 76

            //Initializing the PropertiesInformation list with required Information
            objectData.PropertiesInformation = new PropertyInformation[3]; // 3 properties are passed for lead creation.


            //Setting the values of the Phone Property of the Lead Object
            PropertyInformation propPhone = new PropertyInformation();
            propPhone.Id = 4810086;//ID of the Phone Property of the Lead Object.
            propPhone.Value = "566-523-4373";//Value of the Phone Property of the Lead Object.
            objectData.PropertiesInformation[0] = propPhone;

            //Setting the values of the PropertyInformation class for the Education Level Property of the Lead Object
            PropertyInformation propEducationLevel = new PropertyInformation();
            propEducationLevel.Id = 4810019; //ID of the Education Level Property of the Lead Object.
            propEducationLevel.Value = "1";//Instance ID of High School
            objectData.PropertiesInformation[1] = propEducationLevel;

            //Setting the values of the PropertyInformation class for the Lead Category Property of the Lead Object
            PropertyInformation propLeadCategory = new PropertyInformation();
            propLeadCategory.Id = 4810074; //ID of the Lead Category Property of the Lead Object.
            propLeadCategory.Value = "1"; // Index of the enumerated value of the Lead Category Property.
            objectData.PropertiesInformation[2] = propLeadCategory;

            //Intializing GeneralInfo structure
            GeneralInfo[] generalInfo = new GeneralInfo[2];
            generalInfo[0] = new GeneralInfo();
            generalInfo[0].KeyName = "updateReadOnly";
            generalInfo[0].KeyValue = "yes"; // Passing the value as yes to allow update to the read-only properties of the Lead Object.


            generalInfo[1] = new GeneralInfo();
            generalInfo[1].KeyName = "IgnoreMandatory";
            generalInfo[1].KeyValue = "no"; // Passing the value as no to ignore the unfilled mandatory properties check.

            //Declare the OperationInformation which provides details of Operation
            OperationInformation operationInfo = null;

            //Intializing ReturnStatus
            ReturnStatus returnStatus = new ReturnStatus();

            //Calling CreateInstance method for Lead Creation
            returnStatus = SISService.UpdateInstance(objectData, generalInfo, out operationInfo);

            if (returnStatus.StatusId != 0)
            {
                //Operation Failed, Handle Failure.
            }
        }