You may have rebind the original data source when you turn the page. You can do this.

1. define a viewstate ["cached data"] on the page;

2. in PageLoad! When IsPostBack, give the first source to this ViewState ["cached data"], and then set the GridView DataSource to ViewState ["cached data"].

3. When clicking the query, assign the queried data to ViewState ["cached data"],

that's all.

then write

GridView. datasource = viewstate ["cached data"] in the paginated code;

GridView.PageIndex = e.NewPageIndex;

GridView.DataBind();

If there is a lot of data, putting it in ViewState will slow down the page loading, and putting it in Session will be better. You can call me if you don't understand.