ASP.Net C# Search Box

hello @Eric for according as your query there are two ways for  searching  data
1. is that you can search data in gridview for this you can refers following sites
http://www.aspdotnet-suresh.com/2011/12/search-records-in-gridview-and.html

http://www.aspsnippets.com/Articles/Search-records-in-GridView-and-highlight-results-in-ASPNet-using-C-and-VBNet.aspx

and second is that you can search data from table which you are binding to gridview using "Select Query";

as
DataRow[] dr;
  dr = Table.Select("where id='" + TextBox1.Text + "'");
now you can retrieve data from datarow dr

You can select any method as your requirement and  choice

Use the following query in your textbox_valuechanged event:
select name,address,mobile_no from your_table where name like '%textbox1.text%'
 Reference: 

http://www.c-sharpcorner.com/Blogs/46617/get-the-values-from-the-any-combination-of-a-record-from-tab.aspx

Like A Search Button in a Web Form, Like I want To Search A Data From A Gridview , Can You Help Me ?? Thank You

what kind of help you need please explain.