How to read created connection string of Web.Config in C# code behind to pass query? [Resolved]

Posted by Nikhilst05 under C# on 10/6/2011 | Points: 10 | Views : 30362 | Status : [Member] | Replies : 3

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I want to know that How to read created connection string of Web.Config in code behind to pass query?

My project is C# ASP.NET 4.0 and Sql Server 2010 based.

for e.g. if my Connection String in Web.Config

<connectionStrings>
    <add name="LocalSqlServer" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
  </connectionStrings>

than, how to use it in Code behind to pass some sql query say,

select *  nikhil where name='Tamhankar';

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Posted by: Ndebata on: 10/6/2011 [Member] Starter | Points: 50

0	First add a reference to System.Configuration string conString = System.Configuration.ConfigurationManager.ConnectionStrings["LocalSqlServer"].ConnectionString; DataTable dt = new DataTable(); using (System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(conString)) { using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand()) { cmd.Connection = con; cmd.CommandText = @"select * from nikhil[TABLENAME] where name=@Name"; cmd.CommandType = CommandType.Text; cmd.Parameters.AddWithValue("@Name", "Tamhankar"); con.Open(); using (SqlDataReader rdr = cmd.ExecuteReader()) { dt.Load(rdr); } } } // Now you can use this datatable dt Nikhilst05, if this helps please login to Mark As Answer. \| Alert Moderator

First add a reference to System.Configuration

string conString = System.Configuration.ConfigurationManager.ConnectionStrings["LocalSqlServer"].ConnectionString;

                DataTable dt = new DataTable();

                using (System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(conString))

                {

                    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand())

                    {

                        cmd.Connection = con;

                        cmd.CommandText = @"select *  from nikhil[TABLENAME] where name=@Name";

                        cmd.CommandType = CommandType.Text;

                        cmd.Parameters.AddWithValue("@Name", "Tamhankar");

                        con.Open();

                        

                        using (SqlDataReader rdr = cmd.ExecuteReader())

                        {

                            dt.Load(rdr);

                        }

                    }

                }

                // Now you can use this datatable dt

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Posted by: Blessyjees on: 10/6/2011 [Member] Bronze | Points: 25

0	Hi, You can use system.Data.Sql namespace and its classes See this link http://www.techtoolblog.com/archives/webconfig-connection-string-settings-in-net-20 Blessy Baby Digitalmesh Softech pvt Ltd https://blessybaby.wordpress.com/ Nikhilst05, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Atshul on: 7/2/2013 [Member] Starter | Points: 25

0	Dear All, please tell me my web config file where i am establish connection with our database so please tell me it is correct or not or there is any changes required because i am facing several problems like as..dataset is empty or connection did not open or close properly. connection is connected. or table 0 can not found or table column <field1> not found....if i will restart IIS then every think is Ok then these problems will not occur until 1 hr or may be 4 hr. <connectionStrings> <add name="SQLConnectStr" connectionString="Data Source=server\sqlexpress;Initial Catalog=DOCDATA;User ID=sa;Password=sa;"/> </connectionStrings> Atul Sharma Nikhilst05, if this helps please login to Mark As Answer. \| Alert Moderator

Dear All,

please tell me my web config file where i am establish connection with our database so please tell me it is correct or not or there is any changes required because i am facing several problems like as..dataset is empty or connection did not open or close properly. connection is connected. or table 0 can not found or table column <field1> not found....if i will restart IIS then every think is Ok then these problems will not occur until 1 hr or may be 4 hr.

<connectionStrings>
<add name="SQLConnectStr" connectionString="Data Source=server\sqlexpress;Initial Catalog=DOCDATA;User ID=sa;Password=sa;"/> </connectionStrings>

Atul Sharma

Nikhilst05, if this helps please login to Mark As Answer. | Alert Moderator

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