Insert Statement

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Hi

Im trying to insert values in a database but i get the following error:"No value given for one or more required parameters"

//Below is my code

C#

protected void btnAddCourse_Click(object sender, EventArgs e)
   {
       //try
       //{
           string connString = ConfigurationManager.ConnectionStrings["courses"].ConnectionString;
           // set up and open connection
           dbConn = new OleDbConnection(connString);
           dbConn.Open();
           string updateSql = "UPDATE Courses " + "SET coursePrice = @price, StartDate=@date, Duration=@duration, Venue=@venue " + "WHERE Venue = @courseNo";
           dbCmd = new OleDbCommand(updateSql, dbConn);

           dbCmd.Parameters.Add("@price", OleDbType.VarChar, 20, "coursePrice");
           dbCmd.Parameters.Add("@date", OleDbType.VarChar, 20, " StartDate");
           dbCmd.Parameters.Add("@duration", OleDbType.VarChar, 10, "Duration");
           dbCmd.Parameters.Add("@venue", OleDbType.VarChar, 20, " Venue");

           dbCmd.Parameters["@price"].Value = txtPrice.Text;
           dbCmd.Parameters["@date"].Value = txtDate.Text;

           dbCmd.Parameters["@duration"].Value = txtDuration.Text;
           dbCmd.Parameters["@venue"].Value = txtVenue.Text;

           dbCmd.ExecuteNonQuery();
           MessageBox.Show("Added");

       //}
       //catch(OleDbException ex)
       //{
       //    MessageBox.Show(ex.Message);
       //}

   }

Posted 16-Oct-10 4:33am

Anele Ngqandu

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OriginalGriff · Answer 1 · 2010-10-16T04:51:00

string updateSql = "UPDATE Courses " + "SET coursePrice = @price, StartDate=@date, Duration=@duration, Venue=@venue " + "WHERE Venue = @courseNo";

Note the final parameter: "@courseNo".
Where do you set it? You set all the others!

BTW: An UPDATE command does not add any records - it modifies an existing one. So you are either using the wrong SQL command and want INSERT instead, or your method name is wrong, as well as your message box!