Connecting to SQL Server using windows authentication

Question

When I was trying to connect to SQL Server using the following code   SqlConnection con   new SqlConnection  Server localhost Authentication Windows Authentication  Database employeedetails    con Open    SqlCommand cmd  string s    delete employee where empid 103     I get the following error      A network-related or instance-specific error occurred while establishing a connection to SQL Server  The server was not found or was not accessible  Verify that the instance name is correct and that SQL Server is configured to allow remote connections   provider  SQL Network Interfaces  error  25 - Connection string is not valid

User · Answer

A connection string for SQL Server should look more like: "Server= localhost; Database= employeedetails; Integrated Security=True;"

If you have a named instance of SQL Server, you'll need to add that as well, e.g., "Server=localhost\sqlexpress"

User · Answer

This worked for me   in web config file    lt add name  connectionstring name   connectionstring  server SQLserver name  database  databasename  integrated security   true   gt

User · Answer

Just replace the first line with the below  SqlConnection con   new SqlConnection  quot Server localhost Database employeedetails Trusted Connection True quot     Regards

User · Answer

I was facing the same issue and the reason was single backslah  I used double backslash in my  Data source  and it worked  connetionString    Data Source localhost  SQLEXPRESS Database databasename Integrated Security SSPI

User · Answer

use this code  Data Source   Initial Catalog master Integrated Security True

User · Answer

Your connection string is wrong   lt connectionStrings gt      lt add name  ConnStringDb1  connectionString  Data Source localhost SQLSERVER Initial Catalog YourDataBaseName Integrated Security True   providerName  System Data SqlClient    gt   lt  connectionStrings gt

User · Answer

Check out www connectionstrings com for a ton of samples of proper connection strings   In your case  use this   Server localhost Database employeedetails Integrated Security SSPI   Update  obviously  the service account used to run ASP NET web apps doesn t have access to SQL Server  and judging from that error message  you re probably using  anonymous authentication  on your web site   So you either need to add this account IIS APPPOOL ASP NET V4 0 as a SQL Server login and give that login access to your database  or you need to switch to using  Windows authentication  on your ASP NET web site so that the calling Windows account will be passed through to SQL Server and used as a login on SQL Server

User · Answer

You have to add a connectionString within your Web config file as   lt connectionStrings gt       lt add name  ASPNETConnectionString  connectionString  Data Source SONU SA Initial Catalog ASPNET Integrated Security True          providerName  System Data SqlClient    gt   lt  connectionStrings gt    Then Write your SQL connection string as below   using System  using System Collections Generic  using System Linq  using System Web  using System Web UI  using System Web UI WebControls  using System Data  using System Data SqlClient  using System Configuration    public partial class WebPages database   System Web UI Page       SqlConnection con   new SqlConnection ConfigurationManager ConnectionStrings  ASPNETConnectionString   ToString         SqlDataAdapter da      DataSet ds       protected void Page Load object sender  EventArgs e                   protected void btnAdmnNumber Click object sender  EventArgs e                string qry    select   from Table           da   new SqlDataAdapter qry  con           ds   new DataSet            da Fill ds            GridView1 DataSource   ds          GridView1 DataBind              For more Information please follow this link How To Connect to SQl with windows Authentication  SQL Server with windows authentication

User · Answer

Use this code          SqlConnection conn   new SqlConnection            conn ConnectionString     quot Data Source HOSTNAME SQLEXPRESS  Initial Catalog DataBase  Integrated Security True quot           conn Open            MessageBox Show  quot Connection Open    quot            conn Close

[c#] Connecting to SQL Server using windows authentication

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