private async void ChangeDatasource(FeatureLayer featLayer, string newGDB)
        {
                await QueuedTask.Run(() =>
                {
                    // provide a replacement data connection object
                    CIMDataConnection updatedDataConnection = new CIMStandardDataConnection()
                    {
                        WorkspaceConnectionString 
 
= $"DATABASE={newGDB}",
                        WorkspaceFactory = WorkspaceFactory.FileGDB,
                        DatasetType = esriDatasetType.esriDTFeatureClass,
                        Dataset = featLayer.Name
                    };
                    // the updated Data connection should look like this:
                    
 
// CustomWorkspaceFactoryCLSID: null
                    // Dataset: "TestMultiPoints"
                    // DatasetType: esriDTFeatureClass
                    // WorkspaceConnectionString: "DATABASE=C:\\Data\\FeatureTest\\FeatureTest.gdb"
                    // WorkspaceFactory: FileGDB

                    
 
// overwrite the data connection
                    featLayer.SetDataConnection(updatedDataConnection);
                });
        }