Update Several Asp.Net Controls together

Say we have two or more controls, on more than one forms. We want to update those controls, if there is a selection or change occurs at any one of them. How will we do this ?

keep them pointing to same DataSource like as follows.

public void UpdateControls()
    List<string> filesDataSource = GetFiles(); // replace with your Datasource

    Control1.DataSource = filesDataSource ;
    Control2.DataSource = filesDataSource ;
    Control3.DataSource = filesDataSource ;


  Control1_SelectedIndexChanged(.............) // Replace with your evnents

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