DataGirdView 光标锁定单元格

 try
   {
    this.dg_Trans.EndEdit();
    if (e.RowIndex == -1) return;
    if (e.RowIndex < 0 || e.ColumnIndex < 0) return;
    if (e.ColumnIndex != 3)
    {
     DataSet dsItem = new DataSet();
     DataAccess.DAFittings Fitting = new DataAccess.DAFittings();
     if (this.dg_Trans.Rows[e.RowIndex].Cells[3].Value != null)
     {
      dsItem = Fitting.GetMaterial(this.dg_Trans.Rows[e.RowIndex].Cells[3].Value.ToString());
      if (dsItem.Tables[0].Rows.Count == 1)
      {
       this.dg_Trans.Rows[e.RowIndex].Cells[2].Value = dsItem.Tables[0].Rows[0][0].ToString();
       this.dg_Trans.Rows[e.RowIndex].Cells[4].Value = dsItem.Tables[0].Rows[0][2].ToString();
      }
      else if (dsItem.Tables[0].Rows.Count == 0)
      {
       MessageBox.Show("提示：物料代码不存在，请从新输入", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
       //this.dg_Trans.ClearSelection();
       //this.dg_Trans.Rows[e.RowIndex].Cells[3].Selected = true;//光标返回到错语代码列  
       this.dg_Trans.EditMode = DataGridViewEditMode.EditOnEnter;
       this.dg_Trans[e.RowIndex, 3] = this.dg_Trans[e.RowIndex, e.ColumnIndex-1]; 
       //this.dg_Trans.CurrentCell = this.dg_Trans[e.RowIndex, 3];
       //this.dg_Trans.BeginEdit(true);
      }
     }
    }    
   }
   catch (Exception err)
   {
   MessageBox.Show(err.Message);
   }