Consume GP service on ArcMap 10.0; how 2 send ArcMap extent ?

dear Readers,

I was looking for examples to do the following:

1. using arcmap 10.0 using geoprocessor function call a webservice in a GP server:

[h=2]DataExtract (GPServer)[/h] Service Description: Data extraction tool

Tasks:

• Data extract

Execution Type: esriExecutionTypeAsynchronous

Result Map Server Name:

MaximumRecords: 1000




The Data Extract contains an input param of current extent:
Parameters:

• Parameter: aoi
  
  • Data Type: GPFeatureRecordSetLayer
    Display Name aoi
    Description: aoi
    Direction: esriGPParameterDirectionInput
    Default Value:
    • Geometry Type: esriGeometryPolygon
      HasZ: false
      HasM: false
      Spatial Reference: 4326 (4326)
      
      Fields:
      • FID ( type: esriFieldTypeOID , alias: FID )
      • Id ( type: esriFieldTypeInteger , alias: Id )
      • Shape_Length ( type: esriFieldTypeDouble , alias: Shape_Length )
      • Shape_Area ( type: esriFieldTypeDouble , alias: Shape_Area )
      Features: None.
      
    
    Parameter Type: esriGPParameterTypeRequired
    Category:
    
    How do I get my current extent and send them as a feature recordset layer to this service
    
    the other input to this service is a table name as present in the feature service in the same arc gis server.
    
    sample code in .net for arcobjects arcmap 10.0 would be great; the gp service is on a 10.21 arc gis server.
    
    regards
    ravi.