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この特定のケースでのSystem.Windows.Forms名前たとえば
private void tab_Control_SelectedIndexChanged(object sender, EventArgs e)
{
var menuItem = (TabControl)sender;
Selected_tab(tab_Control.SelectedTab.Name);
}
void Selected_tab(string tabname)
{
TabPage _tabname = tabname; // Error need to be converted
this.tab_Control.SelectedTab = _tabname;
}