一个winform问题

Question

 这句代码一运行就会弹出对话框提示：输入的字符串格式不正确！     请教大虾解答下，谢谢。               try
            {
     txtRate.Text = ds.Tables[0].Rows[Int32.Parse(this.cboRoomType.SelectedValue.ToString()) - 1] [5].ToString();
            }
            catch (FormatException ex)
            {
                MessageBox.Show(ex.Message);
             
            }

Answer 1

设置断点单步调试一下
看this.cboRoomType.SelectedValue.ToString()它的值

Answer 2

this.cboRoomType.SelectedValue.ToString().trim()