VB.net Loop problem with executereader

Posted on 2009-04-08
Medium Priority
Last Modified: 2013-11-27
I import a csv file into a dataset and then I want to take this information from this dataset and import it to my database. It runs over the first row but then it states:

"Error: System.Data: There is already an open DataReader associated with this Command which must be closed first"

I added cmdstudent.executereader.close() in the loop but it still does not work.

Any suggestions?
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
        Dim conn As SqlConnection
        Dim cmdStudent As New SqlCommand
        Dim cmdStudent1 As New SqlCommand
        Dim daStudent As New SqlDataAdapter
        Dim dsStudent As New DataSet
        Dim dtStudent As New DataTable
        Dim ds1 As New DataSet
        Dim sCon As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\;Extended Properties=Text;"
        Dim objConn As New OleDbConnection(sCon)
        Dim objCmdSelect As New OleDbCommand("SELECT * FROM daily.csv", objConn)
        Dim objAdapter1 As New OleDbDataAdapter
        objAdapter1.SelectCommand = objCmdSelect
        objAdapter1.Fill(ds1, "daily")
        DGV1.DataSource = ds1.Tables(0).DefaultView()
        Dim i As Integer
            conn = GetConnect()
            For i = 0 To (ds1.Tables(0).Rows.Count - 1)
                cmdStudent = conn.CreateCommand
                cmdStudent.CommandText = "INSERT INTO dailyrounds (date,name,price,no,url,high,highnum,mid,midnum,low,lownum)" & _
                   "VALUES ('" & Date.Today & "','" & _
                   ds1.Tables(0).Rows(i)("name") & "'," & _
                   ds1.Tables(0).Rows(i)("price") & "," & _
                   ds1.Tables(0).Rows(i)("no") & ",'" & _
                   ds1.Tables(0).Rows(i)("url") & "','" & _
                   ds1.Tables(0).Rows(i)("high") & "'," & _
                   ds1.Tables(0).Rows(i)("highnum") & ",'" & _
                   ds1.Tables(0).Rows(i)("mid") & "'," & _
                   ds1.Tables(0).Rows(i)("midnum") & ",'" & _
                   ds1.Tables(0).Rows(i)("low") & "'," & _
                   ds1.Tables(0).Rows(i)("lownum") & ") "
            Next i
        Catch ex As Exception
            MsgBox("Error: " & ex.Source & ": " & ex.Message, MsgBoxStyle.OkOnly, "Connection Error !!")
        End Try
    End Sub

Open in new window

Question by:ralphcarter2008
LVL 16

Accepted Solution

sunithnair earned 2000 total points
ID: 24099265
I think your line number 50 should be cmdStudent.ExecuteNonQuery() since you are trying to insert the values into a database table. ExecuteReader is just for reading the data and ExecuteNonQuery is used for DML queries.

Author Closing Comment

ID: 31568123
Good catch!!

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Introduction While answering a recent question about filtering a custom class collection, I realized that this could be accomplished with very little code by using the ScriptControl (SC) library.  This article will introduce you to the SC library a…
Background What I'm presenting in this article is the result of 2 conditions in my work area: We have a SQL Server production environment but no development or test environment; andWe have an MS Access front end using tables in SQL Server but we a…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

619 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