为什么不执行呀,该怎么处理

为什么不执行呀
Combox　SelectValueChanged事件
  private void ComboxSelectValueChanged_Click(object sender, EventArgs e)
  {
  try
  {
  Cursor = Cursors.WaitCursor;
  //String sqlStr = "select ContractNo from Contract " +
  // "where ClientNo='" + this.CustomeNortextBox3.Text + "'and ContractType='" + this.comboBox3.Text + "'";

  String sqlStr = "select ContractNo from Contract " +
  "where ClientNo='" + this.CustomeNortextBox3.Text.Trim() + "'";
  DataSet userDataset = bussiness.ExecuteDetset(sqlStr);
  　　　　　　　　下面的代码怎么不执行呀，郁闷  
  this.ContractComboBox5.DataSource = userDataset.Tables[0];
  this.ContractComboBox5.DisplayMember = "ContractNo";
  this.ContractComboBox5.ValueMember = "ContractNo";
  this.ContractComboBox5.SelectedValue = 1;
   


  }
  catch (Exception ex)
  {
  DisplayErrors(ex);
  }
  finally
  {
  Cursor = Cursors.Arrow;
  }

[解决办法]
是不是出现异常了啊
[解决办法]
学习
[解决办法]
没绑定阿 唉
[解决办法]
bussiness 呢？？
[解决办法]
你凭什么说没执行呢？debug跟踪了？


[解决办法]
调试一下不就知道了吗
[解决办法]
看不出什么原因,是不是bus..那里出錯啊.
[解决办法]
this.ContractComboBox5.DataSource = userDataset.Tables[0]; 
this.ContractComboBox5.DisplayMember = "ContractNo"; 
this.ContractComboBox5.ValueMember = "ContractNo"; 
加上下面这句：
this.ContractComboBox5.DataBind();