This is an Ado.net example written by C# in Visual Studio 2010. It can import multiple files from computer hard drive to MS SQL server database and allow a user to input phone numbers and find out which sample carrier and state it is using. There are two sample carriers: ATT and Verizon. There are three sample states: CA, NC and WI. The database works on MS SQL Server 2008R2. Please feel free to download and/or contribute.