第一个问题：这个查询代码是按排序方法查找的，能不能输入头一个字母就查找出结果的代码？
比如"D*'就把D开头的所有记录

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
        Dim intposition As Integer
        Select Case ComboBox1.SelectedIndex
            Case 0
                objdataview.Sort = "姓名"
            Case 1
                objdataview.Sort = "地址"
            Case 2
                objdataview.Sort = "联系电话"
        End Select
        intposition = objdataview.Find(TextBox1.Text)
        If intposition = -1 Then
            txtrecordposition.Text = "找不到数据"
        Else
            objcurrencymanager.Position = intposition
        End If
        showposition()
    End Sub
第二个问题：查找记录中摸个列（数据类型）的最大值代码怎么写？

第一，用SQL查询语句的"like"，看书或百度，例如：select * from aa where nn like 'd%'
第二，MAX 例如，select max(age) from aa"

具体怎么写呀？我是这样声明的
Public Class Form1
    Dim objconnection As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\数据库\shujuku.accdb")
    Dim objdataadapter As New OleDbDataAdapter("SELECT  姓名，地址，练习电话 FROM biao ORDER BY 序号", objconnection)
    Dim objdataview As DataView
    Dim objdataset As DataSet
    Dim objcurrencymanager As CurrencyManager

是不是重新连接数据库？

从坛子里找个简单的.net操作数据库的例子啃一啃吧

select * from 表名 where 列名 like 'd%' ;