Error in connection string

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C#

class General
    {
        SqlConnection con = new SqlConnection();
        public SqlConnection cn()
        {

            con.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString;
            return con;
        }

        private void cnopen()
        {
            if (con.State == con.Open()) //Operator '==' cannot be applied to  //operands of type 'System.Data.ConnectionState' 

            {
                con.Close();
            }
            con.Open();
        }      
    }

Posted 1-Sep-12 20:39pm

Umapathi K

Updated 1-Sep-12 20:44pm

StM0n

v2

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ridoy · Answer 1 · 2012-09-01T20:53:00

Create a new .cs file and creat there a class as like..

C#

public class databaseConnection
{
    public static string connectionString = "useYourConnectionStringHere";

}

then in your main class use it as..

C#

SqlConnection con;
private void connect()
{
    String s = databaseConnection.connectionString;
    con = new SqlConnection(s);
    con.Open();
}
private void disConnect()
{
    con.Close();
}

then use it in your method or button event as like as..

C#

try
{
  connect();
 .
 .  //use code for retrieving values from database here 
 .
 .
}
catch(Exception e)
{
}

__TR__ · Answer 2 · 2012-09-01T20:57:00

Solution 3

try

C#

if(con.State == ConnectionState.Open)
{
   con.Close();
}

Posted 1-Sep-12 20:57pm

__TR__

StM0n · Answer 3 · 2012-09-01T20:46:00

Solution 1

Open does not return anything (see here[^])

If you want to check the connection.state you have to do it after you opened it...

Posted 1-Sep-12 20:46pm

StM0n

Mohd Imran Saifi · Answer 4 · 2012-09-02T05:22:00

Try This

class General
{
     SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString;);

          public void cnopen()
            {
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
          //if your connection is opened already then this if block do nothing 
          //if your connection is closed then this if block Open your connection.
           }
          public void cnclose()
            {
            if (con.State == ConnectionState.Open)
            {
                con.Close();
            }
          //if your connection is Close already then this if block do nothing 
          //if your connection is Opened then this if block Close your connection.
           }

}

Error in connection string

4 solutions

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