关于Gridview问题

我将从数据库中的记录选出插入到Gridview中，应该是每条记录占用一行，使用循环语句时出错，代码如下：




 Dim strConnect As String = "data source=FG-C99768EB468F\SQLEXPRESS;integrated security = sspi;initial catalog=高校田径运动会"
        Dim sqlConnectionl As SqlClient.SqlConnection
        sqlConnectionl = New System.Data.SqlClient.SqlConnection(strConnect)
        Try
            sqlConnectionl.Open()
            MessageBox.Show("以正确建立连接", "连接正确对话框")
        Catch sqlclient As SqlException
            MessageBox.Show(sqlclient.Message, "连接失败对话框")
            Exit Sub
        End Try
        Dim cmd As New SqlCommand
        cmd.Connection = sqlConnectionl
         = CommandType.Text
        Dim str As String
        str = "select * from tdzfb"
        Dim adapter As New SqlDataAdapter(str, sqlConnectionl)
        Dim dataset As New DataSet
        Dim navigator As BindingManagerBase
        dataset.Clear()
        adapter.Fill(dataset, "tdzfb")
        navigator = Me.BindingContext(dataset, "tdzfb")
        Dim i, j As Integer
        i = 0
        j = navigator.Count
        Do While i <= j - 1  
            Dim c As String = "select * from tdzfb "
             = c
            Dim mydatareader As SqlDataReader = cmd.ExecuteReader()
            mydatareader.Read()
            DataGridView2.Rows(i).Cells(0).Value = mydatareader.GetString(0)   ‘执行到这时系统提示indix错误’
            DataGridView2.Rows(i).Cells(1).Value = mydatareader.GetInt32(1)
            mydatareader.Close()
            i = i + 1
        Loop
        sqlConnectionl.Close()