IConnectionData.GetData method

Called during the data-retrieval loop when it is time to fetch data. GetData is used in conjunction with GetRequiresData.

Namespace:  Microsoft.SharePoint.WebPartPages
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

void GetData()

If the Web Part is waiting for input, it should return immediately. If the Web Part fetches data asynchronously, it should start the data-retrieval work item and return.