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C# Execute Query

Posted on 2009-05-02
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Last Modified: 2012-05-06
I am writing the code below to change passwords on instances of SQL Server. My first attempt, I tried to connect to the default instance by passing the computer name into the connection string:

SqlConnection conn = new SqlConnection("Data Source=" + computerName + ";Initial Catalog=master;User Id=sa;Password=;");.

However, I had an error during compile. Now I am trying by specifying localhost, but getting an "InvalidOperationException". Can someone look at my code and see what I am doing wrong?

-- PS The sa password is blank and the user names exist on the server.
using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SqlClient;

using System.Text;

using Microsoft.Win32;

 

namespace RegistryTest

{

    class Program

    {

        static void Main(string[] args)

        {

            string[] userNames = new string[] { "John", "Michael" };

 

            string computerName = System.Environment.MachineName;

            string password = "password";

 

            //SqlConnection conn = new SqlConnection("Data Source=" + computerName + ";Initial Catalog=master;User Id=sa;Password=;");

            SqlConnection conn = new SqlConnection("Data Source=localhost;Initial Catalog=master;User Id=sa;Password=;");

 

            foreach (string userName in userNames)

            {

                SqlCommand cmd = new SqlCommand("ALTER LOGIN [" + userName + "] WITH PASSWORD=N'" + password + "', conn");

                conn.Open();

                cmd.ExecuteNonQuery();

                conn.Close();

            }

 

            Console.WriteLine("FIN");

        }

    }

}

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Question by:computerstreber
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3 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 24288915
this line is wrong:

                SqlCommand cmd = new SqlCommand("ALTER LOGIN [" + userName + "] WITH PASSWORD=N'" + password + "', conn");
                conn.Open();


must be:

                SqlCommand cmd = new SqlCommand("ALTER LOGIN [" + userName + "] WITH PASSWORD=N'" + password + "' ", conn);
                conn.Open();
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24288916
explanation: in your code, the ",conn" was part of the connection string, instead of specifying the second parameter for the new SqlCommand,..
0
 
LVL 3

Author Closing Comment

by:computerstreber
ID: 31577291
Awesome... that worked beautifully....
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