How do I fix "Public member 'Length' on type 'DBNull' not found" Excel Import Error in .NET?

Posted on 2008-10-21
Last Modified: 2011-10-19
How do I fix "Public member 'Length' on type 'DBNull' not found" Excel Import Error in .NET?
I have attached the file I am attempting to import and the code behind.  The code works, I have successfully used it on another file, but why not this one?

Any help is greatly appreciated.

What am I missing?
Partial Class crc_importcertificates

    Inherits System.Web.UI.Page

    Protected Sub btImport_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btImport.Click

        If FileUpload.HasFile Then

            Dim strFileName As String = ""

            Dim oleDbCommand As New Data.OleDb.OleDbCommand

            Dim oleDbReader As Data.OleDb.OleDbDataReader

            Dim sqlCommand As New Data.SqlClient.SqlCommand("crc_ImportCertificates", New Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("cnDWS").ConnectionString))

            sqlCommand.CommandType = Data.CommandType.StoredProcedure

            'Save File to random filename


            strFileName = ConfigurationManager.AppSettings("FileUploadPath").ToString & CStr(Rnd()) & ".xls"

            If Not System.IO.File.Exists(strFileName) Then


            End If

            oleDbCommand.Connection = New Data.OleDb.OleDbConnection(Replace(ConfigurationManager.AppSettings("cnACT").ToString, "FILENAME", strFileName))

            oleDbCommand.CommandText = "SELECT * FROM [ExportCertificateData$];"



            oleDbReader = oleDbCommand.ExecuteReader

            sqlCommand.Parameters.Add("@first_name", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@last_name", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@address", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@city", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@state", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@zip", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@username", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@password", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@certificate_level", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@mathematics_level", Data.SqlDbType.TinyInt)

            sqlCommand.Parameters.Add("@mathematics_tested", Data.SqlDbType.DateTime)

            sqlCommand.Parameters.Add("@reading_level", Data.SqlDbType.TinyInt)

            sqlCommand.Parameters.Add("@reading_tested", Data.SqlDbType.DateTime)

            sqlCommand.Parameters.Add("@locating_level", Data.SqlDbType.TinyInt)

            sqlCommand.Parameters.Add("@locating_tested", Data.SqlDbType.DateTime)

            sqlCommand.Parameters.Add("@certificate_issued", Data.SqlDbType.DateTime)

            sqlCommand.Parameters.Add("@expiration", Data.SqlDbType.DateTime)

            sqlCommand.Parameters.Add("@testing_location", Data.SqlDbType.VarChar)

            sqlCommand.Parameters.Add("@act_certificate_number", Data.SqlDbType.VarChar)

            'loop through records and update crc_certificates based on results

            While oleDbReader.Read()

                sqlCommand.Parameters("@first_name").Value = IIf(oleDbReader("First Name").Length = 0, System.DBNull.Value, oleDbReader("First Name"))

                sqlCommand.Parameters("@last_name").Value = IIf(oleDbReader("Last Name").Length = 0, System.DBNull.Value, oleDbReader("Last Name"))

                sqlCommand.Parameters("@address").Value = IIf(oleDbReader("Primary Address1").Length = 0, System.DBNull.Value, oleDbReader("Primary Address1"))

                sqlCommand.Parameters("@address").Value &= IIf(oleDbReader("Primary Address2").Length = 0, System.DBNull.Value, oleDbReader("Primary Address2"))

                sqlCommand.Parameters("@address").Value &= IIf(oleDbReader("Primary Address3").Length = 0, System.DBNull.Value, oleDbReader("Primary Address3"))

                sqlCommand.Parameters("@city").Value = IIf(oleDbReader("Primary City").Length = 0, System.DBNull.Value, oleDbReader("Primary City"))

                sqlCommand.Parameters("@state").Value = IIf(oleDbReader("Primary State").Length = 0, System.DBNull.Value, oleDbReader("Primary State"))

                sqlCommand.Parameters("@zip").Value = IIf(oleDbReader("Primary PostalCode/ZipCode").Length = 0, System.DBNull.Value, oleDbReader("Primary PostalCode/ZipCode"))

                sqlCommand.Parameters("@username").Value = oleDbReader("MyWorkKeys UserName")

                sqlCommand.Parameters("@password").Value = oleDbReader("Password")

                sqlCommand.Parameters("@certificate_level").Value = oleDbReader("Certificate Level")

                sqlCommand.Parameters("@mathematics_level").Value = oleDbReader("Applied Mathematics Score")

                sqlCommand.Parameters("@mathematics_tested").Value = oleDbReader("Applied Mathematics Test Date")

                sqlCommand.Parameters("@reading_level").Value = oleDbReader("Reading for Information Score")

                sqlCommand.Parameters("@reading_tested").Value = oleDbReader("Reading for Information Test Date")

                sqlCommand.Parameters("@locating_level").Value = oleDbReader("Locating Information Score")

                sqlCommand.Parameters("@locating_tested").Value = oleDbReader("Locating Information Test Date")

                sqlCommand.Parameters("@certificate_issued").Value = oleDbReader("Certificate Issue Date")

                sqlCommand.Parameters("@expiration").Value = oleDbReader("Certificate Expiration Date")

                sqlCommand.Parameters("@testing_location").Value = oleDbReader("Last Known Testing Location")

                sqlCommand.Parameters("@act_certificate_number").Value = oleDbReader("Certificate Identifier")


            End While



            'clean up


            lblStatus.Visible = True

        End If

    End Sub

    Protected Sub btReturn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btReturn.Click

        Response.Redirect("default.aspx", True)

    End Sub

End Class

Open in new window

Question by:devnewbee
1 Comment
LVL 18

Accepted Solution

UnifiedIS earned 500 total points
ID: 22769483
You can also usually just bypass the null checks with empty strings
sqlCommand.Parameters("@address") = string.empty & oleDbReader("Primary Address1")

Another way would be to reverse your iiif logic
if isdbnull(oledbreader(fieldname)) then dbnull.value else oledbreader(fieldname)


Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Close tabpage of custom control 9 23
Advice in Xamarin 21 52
Set email body to html using vbscript 6 24
C#.NET and microsoft certification. 3 31
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…

911 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now