用于读取text文档的数据
If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
            Try
                Dim sr As New (OpenFileDialog1.FileName)
                Do While endof = False
                    vin = sr.ReadLine.Substring(0, 17)
                    SelectStr = "select * from saomiaovin where vin= '" & vin & "' "
                    Dim Resault As DataTable
                    Resault = AccessOperation.ACCESSOperate(SelectStr, msg)
                    If Resault.Rows.Count = 0 Then
                        'MsgBox(vin + "已经扫描过，将覆盖该VIN号")
                        InsertStr = "insert into saomiaovin values('" & vin & "') "
                        AccessOperation.ACCESSOperate(InsertStr, msg)
                    End If
                    endof = sr.EndOfStream
                Loop
                sr.Close()
                MsgBox("数据导入成功！")
            Catch
                MsgBox(Err.Description)
            End Try
        End If

读取excle的数据
If Me.OpenFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
            Dim str As String = Me.OpenFileDialog1.FileName
            Dim cn As System.Data.OleDb.OleDbConnection
            Dim cmd As System.Data.OleDb.OleDbDataAdapter
            Dim ds As New System.Data.DataSet()
            MsgBox(str)
            cn = New System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;" & _
                "data source= " & str & ";Extended Properties=Excel 8.0;")
            ' Select the data from Sheet1 of the workbook.
            cmd = New System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", cn)
            cn.Open()
            cmd.Fill(ds)
            cn.Close()
            Dim table As DataTable = ds.Tables(0)
            Me.DataGridView1.DataSource = table
        End If

在中这个&符号有多少种用用途?

已阅~