c# - Creating social website in asp.net -

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i'm creating social networking website used "social networking website in asp.net - open source" http://www.c-sharpcorner.com/uploadfile/rahul4_saxena/social-networking-website-in-asp-net-open-source-project/ when tried run project on visual studio 2012 edition showing error below,

a network-related or instance-specific error occurred while establishing connection sql server. server not found or not accessible. verify instance name correct , sql server configured allow remote connections. (provider: named pipes provider, error: 40 - not open connection sql server) source error: 

using system; using system.collections.generic; using system.linq; using system.web; using system.data; using system.data.sqlclient;   /// <summary> /// summary description databaseclass /// </summary> public class databaseclass {     sqldataadapter da;     sqlconnection con;     sqlcommand cmd = new sqlcommand();     dataset ds = new dataset();     datatable dt = new datatable();      public databaseclass()     {         //         // todo: add constructor logic here         //     }      public void connectdatabasetoinsert(string query)     {         con = new sqlconnection(@"data source=veena-sqlserver2008; initial catalog=rnetworkingwebapplication;");         cmd.commandtext = query;         cmd.connection = con;         da = new sqldataadapter(cmd);                 con.open();         cmd.executenonquery();                con.close();      }     public dataset connectdatabasereturnds(string query)     {         ds = new dataset();         con = new sqlconnection(@"data source=veena-sqlserver2008; initial catalog=rnetworkingwebapplication;");         cmd.commandtext = query;         cmd.connection = con;         da = new sqldataadapter(cmd);         da.fill(ds);         con.open();         cmd.executenonquery();         con.close();                 return ds;     }     public datatable connectdatabasereturndt(string query)     {         dt = new datatable();         con = new sqlconnection(@"data source=veena-sqlserver2008; initial catalog=rnetworkingwebapplication;");         cmd.commandtext = query;         cmd.connection = con;         da = new sqldataadapter(cmd);         da.fill(dt);         con.open();         cmd.executenonquery();         con.close();         return dt;     } }

visual studio pointing error here da.fill(dt). have spent 2 days debug error still couldn't. please me.

it simple. code not able connect database. open server explorer in visual studio , connect database confirm able connect. , connection string right.

and have database, right?


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