Ask: retrieve the fixed value in the DataGrid

Private   Static   String Sushename_private;
Private   Void Datagrid1_editcommand ( Object Source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
This. Datagrid1.edititemindex=E. Item. itemindex;
Sushename_private= This. Datagrid1.items [E. Item. itemindex]. cells [0]. Text. Trim (). tostring ();
This. Bindtodg ();
}

Private   Void Datagrid1_updatecommand ( Object Source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
//Judge sushename_private;
}

I want to retrieve the original sushename_private for judgment and perform subsequent operations.
Sushename_private is always empty.
What is the problem?