namespace CustomImporter
{
[DtsPipelineComponent(
    DisplayName = "Custom importer",
    Description = "Custom Importer",
    IconResource = "CustomImporter.ico",
    UITypeName = "CustomImporter.CustomImporterUI, CustomImporter.CustomImporter, Version=1.1.0.0, Culture=neutral, PublicKeyToken=9b0a5b72a437255d",
    ComponentType = ComponentType.SourceAdapter)
]

public class CustomImporter : Microsoft.SqlServer.Dts.Pipeline.PipelineComponent
{
//code to implement the class
}

using System;
using System.Windows.Forms;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Pipeline.Design;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;

namespace CustomImporter
{
    class CustomImporterUI : IDtsComponentUI
    {

        #region Members

            IDTSComponentMetaData100 metaData;
            IServiceProvider serviceProvider;

        #endregion

        #region IDtsComponentUI Member

        bool IDtsComponentUI.Edit(IWin32Window parentWindow, Variables variables, Connections connections)
        {
            frmMain editor = new frmMain(metaData, serviceProvider, variables, connections);

            DialogResult result = editor.ShowDialog(parentWindow);

            if (result == DialogResult.OK)
                return true;

            return false;
        }

        void IDtsComponentUI.Help(IWin32Window parentWindow) {}

        void IDtsComponentUI.Initialize(IDTSComponentMetaData100 dtsComponentMetadata, IServiceProvider serviceProvider)
        {
            this.metaData = dtsComponentMetadata;
            this.serviceProvider = serviceProvider;
        }

        void IDtsComponentUI.New(IWin32Window parentWindow){}

        void IDtsComponentUI.Delete(IWin32Window parentWindow){}

        public void Initialize(IDTSComponentMetaData100 dtsComponentMetadata, IServiceProvider serviceProvider)
        {
            // Store the component metadata.
            this.metaData = dtsComponentMetadata;
        }

        #endregion

    }
}