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Using DataLinks to get or edit a connection string

, 9 Mar 2004
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Accessing DataLinks from a .NET program to get or edit a connection string.

Sample Image - DataLinks.gif

Introduction

A similar article was written on this subject but this article deals with accessing DataLinks from a .NET program to get or edit a connection string. Your project must reference DataLinks and ADODB, then execute the PromptNew or PromptEdit methods.

Step by step procedure

  1. Reference ADODB in your project. This is required to read the COM object passed back from DataLinks. This file is located here: c:\Program Files\Microsoft.NET\Primary Interop Assemblies\adodb.dll
  2. Reference DataLinks in your project. DataLinks used to be MSDASC.dll, but has changed to OLEDB32.DLL (see KB). This file is located here: C:\Program Files\Common Files\System\Ole DB\OLEDB32.DLL
  3. Create a text box and a button on a Windows Form. In the button's click event, use this code:
private void ButtonGetConnectionString_Click(object sender, 
  System.EventArgs e)
{
   /* 
        Reference DataLinks
        NOTE: Reference 
              C:\Program Files\Common Files\System\Ole DB\OLEDB32.DLL
              (Was MSDASC.dll) 
        SEE:
           http://support.microsoft.com:80/support/kb/articles/Q225/1/32.asp
   */
      MSDASC.DataLinks dataLinks = new MSDASC.DataLinksClass();
      //note that a reference to: 
      //  c:\Program Files\Microsoft.NET\Primary Interop Assemblies\adodb.dll
      //is also required to read the ADODB._Connection result
      ADODB._Connection connection;                         
      //are we editing an existing connect string or getting a new one?
      if(this.txtConnectionString.Text==String.Empty)
      {     
            // get a new connection string
            try   
            {           
               //Prompt user for new connect string
               connection = (ADODB._Connection)dataLinks.PromptNew();
               //read result
               this.txtConnectionString.Text=
                    connection.ConnectionString.ToString();
            }
            catch(Exception ex)     
            {
                  MessageBox.Show(ex.ToString());     
            }
      }
      else
      {     
            // edit connection string
            connection=new ADODB.ConnectionClass();
            connection.ConnectionString=this.txtConnectionString.Text;
            //set local COM compatible data type
            object oConnection=connection;
            try   
            {     
                  //prompt user to edit the given connect string
                  if((bool)dataLinks.PromptEdit(ref oConnection))
                  {
                        this.txtConnectionString.Text=
                             connection.ConnectionString;
                  }
            }
            catch(Exception ex)
            {
                  MessageBox.Show(ex.ToString());     
            }
      }
}

License

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About the Author

DanMayer
Web Developer
United States United States
No Biography provided

Comments and Discussions

 
Question64 / 32 bit drivers? Pinmemberrichardbrigzy21-Sep-12 15:02 
AnswerRe: 64 / 32 bit drivers? Pinmemberjonpetitta18-Aug-14 9:08 
GeneralProblem with the waitcursor PinmemberPrimozPayton25-Aug-08 2:44 
GeneralSqlClient Issue with Provider Property PinmemberBrady Kelly28-Jul-07 23:07 
I just found your code now after building a similar class last year. I was doing some Googling to clear up some issues and came across your article, and I thought I'd share an experience with you.
 
When editing ADO.NET SqlClient connection strings, that don;t include a "Provider=xxx;" part, on opening a connection the dialogue selects the default ODBC provider, where one is used to seeing the SQL Server Provider. I worked around this issue by adding a flag to my class, IsSqlServerProvider, that when set, automatically adds a Provider=SQLOLEDB.1;" to 'incoming' connection strings, so that the editor selects the correct provider for editing, and then removes this from 'outgoing' strings so that the SqlClient provider doesn't complain.
 
However, I had one problem I had to solve with a kludge: sometimes the editor added "Provider=SQLOLEDB;", without the ".1", so my stripping code missed it. I cannot find why it sometimes adds the ".1" and sometimes not, on the same server and same database, so for now I check for both in some rather smelly code.
 

GeneralNo need for interop PinmemberSergey Prokhorenko24-Jun-07 23:38 
GeneralRe: No need for interop PinmemberSergey Prokhorenko24-Jun-07 23:42 
GeneralRe: No need for interop PinmemberBrady Kelly28-Jul-07 22:58 
GeneralRe: No need for interop PinmemberMember 871442120-Nov-13 4:10 
GeneralSpeed Pinmemberakorolev103-Oct-04 0:24 
GeneralGreat! Give me exact what I am looking for Pinmemberzhoulhh1-Jul-04 7:39 
GeneralPromptEdit(ref connectionString) PinmemberUnderEducated10-Mar-04 10:33 
GeneralRe: PromptEdit(ref connectionString) PinmemberDanMayer10-Mar-04 10:55 
GeneralRe: PromptEdit(ref connectionString) PinmemberUnderEducated10-Mar-04 12:03 
GeneralRe: PromptEdit(ref connectionString) [modified] Pinmembermlgray3-Jul-06 23:06 
GeneralRe: PromptEdit(ref connectionString) Pinmemberyetty200026-Oct-07 6:10 
GeneralRe: Very Slow... PinmemberVHsu13-Feb-04 19:41 
GeneralRe: Very Slow... PinmemberDanMayer14-Feb-04 6:45 
GeneralRe: Very Slow... Pinsussmgarins19-Feb-04 4:20 
GeneralRe: Very Slow... PinmemberRicardo Casquete17-Feb-06 23:55 

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