GridView的多数据查询解决方法

GridView的多数据查询
前台代码
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
ForeColor="#333333" GridLines="None" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" 
OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" >
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<Columns > 
<asp:BoundField DataField="id" HeaderText="用户ID" ReadOnly="True" /> 
<asp:BoundField DataField="name" HeaderText="用户姓名" ReadOnly="true" /> 
<asp:BoundField DataField="tel" HeaderText="联系方式" ReadOnly="true" /> 
<asp:BoundField DataField="yw" HeaderText="业务情况" />
<asp:CommandField HeaderText="选择" ShowSelectButton="True" /> 
<asp:CommandField HeaderText="编辑" ShowEditButton="True" /> 
<asp:CommandField HeaderText="删除" ShowDeleteButton="True" /> 
</Columns > 
<RowStyle ForeColor="#000066" /> 
<SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" /> 
<PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" /> 
<HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" /> 
</asp:GridView >
    
        <asp:DropDownList ID="DropDownList1" runat="server">
            <asp:ListItem>aa</asp:ListItem>
            <asp:ListItem>bb</asp:ListItem>
        </asp:DropDownList>

后台代码
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;


public partial class Default3 : System.Web.UI.Page 
{
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=.\\SQLEXPRESS;AttachDbFilename=E:\\业务\\App_Data\\yw.mdf;Integrated Security=True;User Instance=True";
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            bind();
        }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }

    //删除数据
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string sqlstr = "delete from yw where id='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
        sqlcon = new SqlConnection(strCon);
        sqlcom = new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        bind();
    }

    //更新数据
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "update yw set yw='"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where id='" 
            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
        sqlcom=new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        GridView1.EditIndex = -1;
        bind();
    }

    //取消数据
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

    {
        GridView1.EditIndex = -1;
        bind();
    }

    //绑定数据
    public void bind()
    {
        string j = DropDownList1.SelectedValue;
        string sqlstr = "select * from yw";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "yw");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "id" };//主键
        GridView1.DataBind();
        sqlcon.Close();
    }
}

如何实现不同数据的查询？ GridView ASP 数据查询
[解决办法]
试试下面的代码，我觉得可以实现，我做过类似的开发。
 

  //绑定数据
     public void bind()
     {
         string j = DropDownList1.SelectedValue;
         //修改下面两行代码，注意where后面要有空格
         string sqlwher = "yw=" + DropDownList1.SelectedItem.Text ;
         string sqlstr = "select * from yw where " + sqlwher;         sqlcon = new SqlConnection(strCon);
         SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon); 
 
         DataSet myds = new DataSet();
         sqlcon.Open();
         myda.Fill(myds, "yw");
         GridView1.DataSource = myds;
         GridView1.DataKeyNames = new string[] { "id" };//主键
         GridView1.DataBind();
         sqlcon.Close();
     }
 }