如何在asp.net的postback函数调用后显示搜索数据?

gridview details show exactly what as i want even search data also show fine but problem is when i post back page and return on search page search is not maintain in gridview i use gridview.Databind() function on page load use (!page.postback) function but then also not useful for me so please can you all give me any code for that on page load i write but not useful for me gridview details show exactly what as i want ev