try this
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (DropDownList1.SelectedValue)
{
case "Browse":
Webpartmanager1.DisplayMode = WebPartManager.BrowseDisplayMode;
break;
case "Design":
Webpartmanager1.DisplayMode = WebPartManager.DesignDisplayMode;
break;
case "Edit":
Webpartmanager1.DisplayMode=WebPartManager.EditDis playMode;
break;
case "Catalog":
Webpartmanager1.DisplayMode = WebPartManager.CatalogDisplayMode;
break;
}
}
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