Solved Loop problem with executereader

Posted on 2009-04-08
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

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Question by:ralphcarter2008
LVL 16

Accepted Solution

sunithnair earned 500 total points
Comment Utility
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

Comment Utility
Good catch!!

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