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J'utilise le code suivant:Comment trouver un élément GridView sur button_click?
foreach (GridViewRow dr in gvrejectreq.Rows)
{
DropDownList ddl=(DropDownList)gvrejectreq.Rows[dr.RowIndex].FindControl("DropDownList1");
string status = ddl.SelectedValue;
int userid = gvrejectreq.Rows[dr.RowIndex].
}