如何通过listbox中selectindexchange 来改变girdview中的数据值，我不能联动，不知什么原因？部分主要代码如下

    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            ShowUnit();
            BindGridView();

        }

    }
    private void BindGridView()
    {
        string sqlStr = "select fid,fno,fdirname,funame,fdate,find from tfile where find like '" + LBunit.SelectedValue.ToString()+"'";

        DataSet dataset = dsc.myAdapeter(sqlStr);
        try
        {
            GridView1.DataSource = dataset;
            GridView1.DataKeyNames = new String[] { "fid" };
            GridView1.DataBind();
        }
        catch (Exception ex)
        {
            Response.Write("数据库错误，错误原因：" + ex.Message);
            Response.End();
        }
        finally
        {
            // 释放占有资源
        }

        lblCurrentIndex.Text = "第" + (GridView1.PageIndex + 1).ToString() + "页";
        lblPageCount.Text = "总共" + GridView1.PageCount.ToString() + "页";
        lblRecordCount.Text = "总共" + dataset.Tables[0].Rows.Count.ToString() + "条";
        if (dataset.Tables[0].Rows.Count == 0)
        {
            lnkbtnFirst.Visible = false;
            lnkbtnPre.Visible = false;
            lnkbtnNext.Visible = false;
            lnkbtnLast.Visible = false;
            lblCurrentIndex.Visible = false;
            lblPageCount.Visible = false;
            lblRecordCount.Visible = false;
        }
        else if (GridView1.PageCount == 1)
        {
            lnkbtnFirst.Visible = false;
            lnkbtnPre.Visible = false;
            lnkbtnNext.Visible = false;
            lnkbtnLast.Visible = false;
        }
        lnkbtnFirst.CommandArgument = "1";
        lnkbtnPre.CommandArgument = (GridView1.PageIndex == 0 ? "1" : GridView1.PageIndex.ToString());
        lnkbtnNext.CommandArgument = (GridView1.PageCount == 1 ? GridView1.PageCount.ToString() : (GridView1.PageIndex + 2).ToString());
        lnkbtnLast.CommandArgument = GridView1.PageCount.ToString();
    }
    //跳转
    protected void lnkbtnJumpPage_Click(object sender, EventArgs e)
    {
        GridView1.PageIndex = Convert.ToInt32(txtJumpPage.Text) - 1;
        lblCurrentIndex.Text = "第" + (GridView1.PageIndex + 1).ToString() + "页";
        BindGridView();
    }
    protected void PagerButtonClick(object sender, EventArgs e)
    {
        GridView1.PageIndex = Convert.ToInt32(((LinkButton)sender).CommandArgument) - 1;
        BindGridView();
    }
    protected void ShowUnit()
    {
        string sqlStr = "select * from tunit";
        DataSet ds = dsc.myAdapeter(sqlStr);
        this.LBunit.DataSource = ds;
        this.LBunit.DataTextField = "uname";
        this.LBunit.DataValueField = "uid";
        this.LBunit.DataBind();
        this.LBunit.SelectedIndex = 0;
    }
    protected void LBunit_SelectedIndexChanged(object sender, EventArgs e)
    {

    } --------------------编程问答-------------------- 在SelectedIndexChanged中添加以下代码：
protected void LBunit_SelectedIndexChanged(object sender, EventArgs e)
    {
         BindGridView();
    }

补充：.NET技术 ,  ASP.NET