public Form1()

 {

            InitializeComponent();

            ESRI.ArcGIS.esriSystem.IAoInitialize AoIni = new AoInitializeClass();

            bool Successful;//返回是否初始化成功

            esriLicenseProductCode production =  esriLicenseProductCode.esriLicenseProductCodeArcInfo;//这里选择的是ArcInfo

            esriLicenseStatus status = AoIni.IsProductCodeAvailable(production);

            if (status == esriLicenseStatus.esriLicenseAvailable)

           {

                  status = AoIni.Initialize(production);

                  if (status == esriLicenseStatus.esriLicenseAlreadyInitialized || status == esriLicenseStatus.esriLicenseCheckedOut)

                  {

                            //SpatialAnalyst

                            esriLicenseExtensionCode extension1 = esriLicenseExtensionCode.esriLicenseExtensionCodeSpatialAnalyst;

                            esriLicenseStatus status1 = AoIni.IsExtensionCodeAvailable(production, extension1);

                            if (status1 == esriLicenseStatus.esriLicenseAvailable)

                            {

                                    status1 = AoIni.CheckOutExtension(extension1);

                            }

                             //DataInteroperability

                             esriLicenseExtensionCode extension2 = esriLicenseExtensionCode.esriLicenseExtensionCodeDataInteroperability;

                             esriLicenseStatus status2 = AoIni.IsExtensionCodeAvailable(production, extension2);

                             if (status2 == esriLicenseStatus.esriLicenseAvailable)

                             {

                                    status2 = AoIni.CheckOutExtension(extension2);

                             }

                             //if (status1 == esriLicenseStatus.esriLicenseCheckedOut && status2 == esriLicenseStatus.esriLicenseCheckedOut)

                             if (status2 == esriLicenseStatus.esriLicenseCheckedOut)

                            {

                                   Successful = true;

                            }

                   }

          }

 }