将数据加载到GridView页面需要一些时间来显示

Question

从下面的代码// Doing some operations开始，页面加载时需要几秒钟，大概30到40秒。然后我打电话给Method()。当我单击索引4（GridView中的页码4）页面时，为了显示页码4，它也占用相同的时间（30到40秒）。但我真的很需要它。我该如何更改代码？ VB.NET中的代码

Protected Sub Page_Load1(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    // Doing some operations
    Method()
End Sub

Protected Sub GridView1_PageIndexChanging(sender As Object, e As GridViewPageEventArgs) Handles GridView1.PageIndexChanging
    GridView1.PageIndex = e.NewPageIndex
    GridView1.DataBind()
End Sub

Private Sub Method()
    Dim sqlConnect As SqlConnection = New SqlConnection(Connection String)
    Dim adapter As New SqlDataAdapter
    Dim ds As DataSet
    Dim sqlString = "SELECT * FROM Table"
    Dim Command As SqlCommand = New SqlCommand(sqlString, sqlConnect)
    adapter.SelectCommand = Command
    adapter.Fill(ds)
    GridView1.DataSource = ds.Tables(0)
    GridView1.DataBind()
End Sub