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How to open connection for datareader

Posted on 2014-11-21
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Last Modified: 2014-11-21
ExecuteReader requires an open and available Connection. The connection's current state is closed.

protected void fill_ddlCodes()
        {
            using (SqlConnection connCode = new SqlConnection(str1964))
            {
                using (SqlCommand cmdCode = new SqlCommand("Select * from view_tbl_codes", connCode))
                {
                    SqlDataReader drCodes;
                    //Getting exception error here...
                    drCodes = cmdCode.ExecuteReader();
                    
                    List<string> lstCodes = new List<string>();
                    foreach(DataRow dr in drCodes)
                    {
                        lstCodes.Add(drCodes["Code"].ToString());
                    }
                    ddlCodes.DataSource = lstCodes;
                    ddlCodes.DataValueField = "Code";
                    ddlCodes.DataTextField = "Code";
                    ddlCodes.DataBind();
                }
            }            
        }

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Question by:Scarlett72
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6 Comments
 
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Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 40457764
Change this line:

drCodes = cmdCode.ExecuteReader();

...to this:

connCode.Open();
drCodes = cmdCode.ExecuteReader()

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Expert Comment

by:Fernando Soto
ID: 40457777
You should also have a close connection before leaving the code, something like this.

connCode.Close();
ddlCodes.DataSource = lstCodes;
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Expert Comment

by:käµfm³d 👽
ID: 40457780
@Fernando

There's already a "close connection" in that code  ; )
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Expert Comment

by:Fernando Soto
ID: 40457786
@Kaufmed missed the using statement, thanks for the update.
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Author Comment

by:Scarlett72
ID: 40457822
Hi Fernando / Kauffmed, thank you both again for your assistance.  The 'open' method on the datareader worked, but I thought because I put my reader in a connection dispose method I didn't have to open or close the connections...
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40457837
You don't have to close it--the using takes care of that--but you do have to open it. If you think about it, it kind of makes sense:  Once you dispose of the connection object, you really don't need it anymore, so you implicitly shouldn't need the underlying connection TCP connection either; but in terms of opening the connection, you may need to do some setup first, potentially a lengthy operation. From a code perspective, you're not always guaranteed at what exact point you will open a connection, but you should always know when you no longer need it.
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