Question

I have a button, a usercontrol which contains a gridview in a page.

How do I click the button in the page and cause its usercontrol’s gridview to change to a certain pageindex?

Answer 1

Provide a public method in your UserControl (f.e. GotoPage(int index)). Then you can change it from your page by MyControl.GotoPage(111);.

GotoPage could be implemented as:

public void GotoPage(int index)
{
    //side-note: you can call BindGrid(e.NewPageIndex) also from GridView's PageIndexChanging
    BindGrid(index);
}

and BindGrid could be implemented as:

private void BindGrid(int newPageIndex)
{
    // set it's DataSource
    var pageIndex = newPageIndex < 0 || newPageIndex >= GridView1.PageCount ? 0 : newPageIndex;
    GridView1.PageIndex = pageIndex;
    // DataBind it
}