How to break out of 2 loops without a flag variable in C#?

1

foreach(DataGridViewRow row in grid.Rows)
   foreach(DataGridView cell in row.Cells)
      if (cell.Value == somevalue) {
         // do stuff
         goto End;
      }
End:
   // more stuff

2

void Loop(grid) {
    foreach(row in grid.Rows)
       foreach(cell in row.Cells)
           if (something) {
               // do stuff   
               return;
           }
}

3

var cell = (from row in grid.Rows.OfType<DataGridViewRow>()
            from cell in row.Cells.OfType<DataGridViewCell>()
            where cell.Value == somevalue
            select cell
   ).FirstOrDefault();

if (cell != null) {
   // do stuff
}