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I have used Make XY Event Layer to Creates a new point feature layer based on x- and y-coordinates using python and it worked for me. Now as a need of my project i want to apply the same in c# using ARCObject SDK10.0 . Additionally i also want to create a table in geodatabase to hold all the xy points in the table with following field : ObjectID, Xcoor,ycoor, Shape. I would appreciate any kind of hint how to do this in c#.

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Based on pecoanddeco's answer, here is the VBA code converted to C#.

Note that you'll need to create the XYSample.txt file and add it to your map as described here

Need to add the following ArcGIS References

  • ESRI.ArcGIS.ArcMapUI
  • ESRI.ArcGIS.CartoUI
  • ESRI.ArcGIS.Display
  • ESRI.ArcGIS.Framework
  • ESRI.ArcGIS.Geodatabase
  • ESRI.ArcGIS.Geometry
  • ESRI.ArcGIS.LoctationUI

using ESRI.ArcGIS.ArcMapUI;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Framework; 
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.LocationUI;

    void AddXYEventLayer()
        IMxDocument mxdoc = ArcMap.Application.Document as IMxDocument;
        IMap map = mxdoc.FocusMap;

        // Get the table named XYSample.txt
        IStandaloneTableCollection stTableCollection = map as IStandaloneTableCollection;
        IStandaloneTable standaloneTable = null;
        ITable table = null;

        for (int i = 0; i < stTableCollection.StandaloneTableCount; i++)
            standaloneTable = stTableCollection.StandaloneTable[i];
            if (standaloneTable.Name == "XYSample.txt")
                table = standaloneTable.Table;

        if (table == null)
            MessageBox.Show("XYSample.txt table was not found in this map.");

        // Get the table name object
        IDataset dataset = table as IDataset;
        IName tableName = dataset.FullName;

        // Specify the X and Y fields
        IXYEvent2FieldsProperties xyEvent2FieldsProperties = new XYEvent2FieldsProperties() as IXYEvent2FieldsProperties;
        xyEvent2FieldsProperties.XFieldName = "x";
        xyEvent2FieldsProperties.YFieldName = "y";
        xyEvent2FieldsProperties.ZFieldName = "";

        // Specify the projection
        ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironment() as ISpatialReferenceFactory;
        IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1983UTM_11N);

        // Create the XY name object as set it's properties
        IXYEventSourceName xyEventSourceName = new XYEventSourceName() as IXYEventSourceName;
        xyEventSourceName.EventProperties = xyEvent2FieldsProperties;
        xyEventSourceName.SpatialReference = projectedCoordinateSystem;
        xyEventSourceName.EventTableName = tableName;

        IName xyName = xyEventSourceName as IName;
        IXYEventSource xyEventSource = xyName.Open() as IXYEventSource;

        // Create a new Map Layer
        IFeatureLayer featureLayer = new FeatureLayer() as IFeatureLayer;
        featureLayer.FeatureClass = xyEventSource as IFeatureClass;
        featureLayer.Name = "Sample XY Event Layer";

        // Add the layer extension (this is done so that when you edit
        // the layer's Source properties and click the Set Data Source
        // button, the Add XY Events Dialog appears)
        ILayerExtensions layerExtensions = featureLayer as ILayerExtensions;
        XYDataSourcePageExtension resPageExtension = new XYDataSourcePageExtension();

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Below is an example for ArcObjects 9.

Create a layer based on XY data

There's also one for ArcObjects 10, but it's only got the VBA code and not the .net code, though hopefully not much has changed so the v9 code should still work.

How to create a layer based on XY data

Or is the issue you're having a more general one with getting started with C#?

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