topic System.Windows.Forms.AxHost+InvalidActiveXStateExc eption in ArcObjects SDK Questions https://community.esri.com/t5/arcobjects-sdk-questions/system-windows-forms-axhost-invalidactivexstateexc/m-p/120261#M3154 <HTML><HEAD></HEAD><BODY><SPAN>Hi, We are developing a WPF based Engine application. In this application, we have tab controls, which have a WindowsFormsHost, which holds the instance of the mapcontrol.</SPAN><BR /><BR /><SPAN>When we switch between the tabs, we remove the mapcontrol from the previous windows formshost and place it in the current tab page's windows form host.</SPAN><BR /><BR /><SPAN>Further, we are setting some properties of the mapcontrol.</SPAN><BR /><BR /><SPAN>In certain cases, when i set the properties of the mapcontrol, i get this error: 'System.Windows.Forms.AxHost+InvalidActiveXStateException' .</SPAN><BR /><BR /><SPAN>I learnt that this error arises when the mapcontrol instance exists but is not held by any container that can draw it. </SPAN><BR /><BR /><SPAN>What i wanted to know was, is there any way to know the activeXState of the mapcontrol? Just checking whether the mapcontrol is null isnt helpful.</SPAN><BR /><BR /><SPAN>Thanks.</SPAN></BODY></HTML> Tue, 04 May 2010 10:11:10 GMT pavankumar 2010-05-04T10:11:10Z System.Windows.Forms.AxHost+InvalidActiveXStateExc eption https://community.esri.com/t5/arcobjects-sdk-questions/system-windows-forms-axhost-invalidactivexstateexc/m-p/120261#M3154 <HTML><HEAD></HEAD><BODY><SPAN>Hi, We are developing a WPF based Engine application. In this application, we have tab controls, which have a WindowsFormsHost, which holds the instance of the mapcontrol.</SPAN><BR /><BR /><SPAN>When we switch between the tabs, we remove the mapcontrol from the previous windows formshost and place it in the current tab page's windows form host.</SPAN><BR /><BR /><SPAN>Further, we are setting some properties of the mapcontrol.</SPAN><BR /><BR /><SPAN>In certain cases, when i set the properties of the mapcontrol, i get this error: 'System.Windows.Forms.AxHost+InvalidActiveXStateException' .</SPAN><BR /><BR /><SPAN>I learnt that this error arises when the mapcontrol instance exists but is not held by any container that can draw it. </SPAN><BR /><BR /><SPAN>What i wanted to know was, is there any way to know the activeXState of the mapcontrol? Just checking whether the mapcontrol is null isnt helpful.</SPAN><BR /><BR /><SPAN>Thanks.</SPAN></BODY></HTML> Tue, 04 May 2010 10:11:10 GMT https://community.esri.com/t5/arcobjects-sdk-questions/system-windows-forms-axhost-invalidactivexstateexc/m-p/120261#M3154 pavankumar 2010-05-04T10:11:10Z Re: System.Windows.Forms.AxHost+InvalidActiveXStateExc eption https://community.esri.com/t5/arcobjects-sdk-questions/system-windows-forms-axhost-invalidactivexstateexc/m-p/120262#M3155 <HTML><HEAD></HEAD><BODY><SPAN>Try looking into MapControl.OcxState</SPAN><BR /><SPAN>That may help you out.</SPAN></BODY></HTML> Wed, 05 May 2010 12:17:40 GMT https://community.esri.com/t5/arcobjects-sdk-questions/system-windows-forms-axhost-invalidactivexstateexc/m-p/120262#M3155 NickClayton 2010-05-05T12:17:40Z