Solved

c# - Error -> Parameter 'string' not found in the collection.

Posted on 2009-05-18
11
1,384 Views
Last Modified: 2013-12-17
Hi Experts,

           I have written a SP in MYSQL to check the login information and returning a value to the c# code.I am getting the following error :

Aurgument exception was unhandled.
Parameter 'string' not found in the collection.

C# :
 
 private void btnOK_Click(object sender, EventArgs e)
        {
            MySqlConnection myConn = new MySqlConnection(ConfigurationSettings.AppSettings["Con"].ToString());
            MySqlCommand myCommand = new MySqlCommand("sp_LoginCheck", myConn);
            myCommand.CommandType = CommandType.StoredProcedure;
            MySqlParameter myParm = new MySqlParameter();
            myParm = myCommand.Parameters.Add("@UserName", MySqlDbType.VarChar, 50);
            myParm.Value = "srk1";
            myParm = myCommand.Parameters.Add("@Password", MySqlDbType.VarChar, 50);
            myParm.Value = "pwd1";
            myParm = myCommand.Parameters.Add("@DoesExist", MySqlDbType.Bit);
            myParm.Direction = ParameterDirection.Output;
            myConn.Open();
            myCommand.ExecuteNonQuery();
            bool doesExist = (bool)myCommand.Parameters["@DoesExist"].Value;
            if (!doesExist)
            {
                MessageBox.Show("UserName/Password invalid.");
            }
            else
            {
                MessageBox.Show("Logged in successfully.");
            }
            myConn.Close();
        }
________________________________________________
Mysql SP :
 
DELIMITER $$
 
DROP PROCEDURE IF EXISTS `demo`.`sp_LoginCheck`$$
 
CREATE PROCEDURE `demo`.`sp_LoginCheck`(
   
 IN UserName1 varchar(50),
 IN Password1 varchar(50),
 OUT DoesExist bit)   
    BEGIN
 declare userCount INT default 0;
 SET DoesExist = 0; -- set to false initially, we'll assume for now it doesn't exist
 SELECT COUNT(Uid) INTO userCount
 FROM tbl_Users
 WHERE username = username1 and password=password1;
 IF userCount > 0 THEN
  SET DoesExist = 1;  -- more then one returned, return true
 END IF;
    END$$
 
DELIMITER ;
________________________________________________

Open in new window

0
Comment
Question by:srk1982
  • 5
  • 4
  • 2
11 Comments
 
LVL 14

Expert Comment

by:jjardine
ID: 24417905
What line is this casuing an error on?   What happens if you close the connection after running the ExecuteNonQuery and then check the value of the parameter?
0
 
LVL 18

Expert Comment

by:philipjonathan
ID: 24417908
Try if changing the following lines help (use ? instead of @):

myParm = myCommand.Parameters.Add("?UserName", MySqlDbType.VarChar, 50);
myParm = myCommand.Parameters.Add("?Password", MySqlDbType.VarChar, 50);
myParm = myCommand.Parameters.Add("?DoesExist", MySqlDbType.Bit);
bool doesExist = (bool)myCommand.Parameters["?DoesExist"].Value;
0
 

Author Comment

by:srk1982
ID: 24417946
Hi jjardine,

Error is coming in the following line...

myCommand.ExecuteNonQuery();
0
Resolve Critical IT Incidents Fast

If your data, services or processes become compromised, your organization can suffer damage in just minutes and how fast you communicate during a major IT incident is everything. Learn how to immediately identify incidents & best practices to resolve them quickly and effectively.

 

Author Comment

by:srk1982
ID: 24417951
Hi philipjonathan,

      I tried your idea, but still the same erorr.


Error is coming in the following line...

myCommand.ExecuteNonQuery();
0
 
LVL 18

Expert Comment

by:philipjonathan
ID: 24418014
Try to use the same name for the parameter (UserName1 and Password1)
myParm = myCommand.Parameters.Add("?UserName1", MySqlDbType.VarChar, 50);
myParm = myCommand.Parameters.Add("?Password1", MySqlDbType.VarChar, 50);
0
 

Author Comment

by:srk1982
ID: 24418034
Hi philipjonathan,

 still same problem !!! :(
0
 
LVL 14

Expert Comment

by:jjardine
ID: 24418049
Your parameters in the code have the @ symbol in front of them, but in the Stored Proc they do not.   Could that be causing an issue?   I don't work with MySQL but within SQL the parameter names are the same so in the sproc they would be @userName   and in the parameter for the command object it would be @userName.
0
 
LVL 18

Accepted Solution

by:
philipjonathan earned 500 total points
ID: 24418108
I search some example on the net, and saw that some don't have '?' in front of argument names.
http://www.aspcode.net/MySQL-DAL-stored-procedures-support-howto-part-14.aspx
http://forums.asp.net/p/988462/1309349.aspx#1309349

I'm not suppose to do trial-and-error with you, but one last try, change the following lines:
myParm = myCommand.Parameters.Add("UserName1", MySqlDbType.VarChar, 50);
myParm = myCommand.Parameters.Add("Password1", MySqlDbType.VarChar, 50);
myParm = myCommand.Parameters.Add("DoesExist", MySqlDbType.Bit);
bool doesExist = (bool)myCommand.Parameters["DoesExist"].Value;

My apologies if this doesn't work
0
 

Author Comment

by:srk1982
ID: 24418136
No opologies philipjonathan.....
Its working great.........
0
 

Author Closing Comment

by:srk1982
ID: 31582833
Thanks.
0
 
LVL 18

Expert Comment

by:philipjonathan
ID: 24418284
Phew! :)
Now I know, I always thought MySQL needs the '?', I was wrong.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question