VB.NET Hide/Delete column in gridview

I've got a page that imports a CSV file into a gridview called gvCensus.  I can't figure out how to hide (or preferably delete) a column.  In a separate sub I try to run gvCensus.Columns.RemoveAt(2) and it tells me the index is out of range.  At runtime the column names appear as F0, F1, F2, etc. but I cannot reference them by that name either.  Here is my code.

Protected Sub btnLoadCensus_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnLoadCensus.Click

        Dim DirInfo As New DirectoryInfo(Server.MapPath("UploadedFiles"))
        If DirInfo.Exists = False Then
            'If folder is not there, Create one.  
            Directory.CreateDirectory(Server.MapPath("UploadedFiles"))
        End If
        If btnBrowse.PostedFile IsNot Nothing Then
            btnBrowse.PostedFile.SaveAs(Server.MapPath(ResolveUrl("~/UploadedFiles/" & btnBrowse.FileName)))
        End If
        fileSavedPath = Server.MapPath(ResolveUrl("~/UploadedFiles/" & btnBrowse.FileName))

        lblSelectError.Visible = False
        stFilePathAndName = btnBrowse.PostedFile.FileName.ToString()
        fileName = btnBrowse.FileName
        filePath = Path.GetDirectoryName(fileSavedPath)

        'Try
        Dim MyConnection As System.Data.OleDb.OleDbConnection
        Dim DtSet As System.Data.DataSet
        Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
        MyConnection = New System.Data.OleDb.OleDbConnection _
        ("provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & filePath & "; Extended Properties=""Text;HDR=No;FMT=Delimited""")
        '("provider=Microsoft.Jet.OLEDB.4.0; Data Source='" & stFilePathAndName & "'; Extended Properties=Excel 8.0;")
        MyCommand = New System.Data.OleDb.OleDbDataAdapter("select * from [" & fileName & "]", MyConnection)
        '("select * from [Sheet1$]", MyConnection)
        MyCommand.TableMappings.Add("Table", "TestTable")
        DtSet = New System.Data.DataSet
        MyCommand.Fill(DtSet)
        gvCensus.DataSource = DtSet.Tables(0)
        gvCensus.DataBind()
        MyConnection.Close()

    End Sub
schwientekdAsked:
Who is Participating?
 
Luis PérezConnect With a Mentor Software Architect in .NetCommented:
Then you can do this:

MyCommand.Fill(DtSet)
MergeName(DtSet)
DtSet.Tables(0).Columns.RemoveAt(2) 'Remove the undesired column
gvCensus.DataSource = DtSet.Tables(0)

Open in new window


And modify your MergeNames sub:

Protected Sub MergeName(ByVal ds As DataSet)
    For Each row As DataRow In ds.Tables(0).Rows
        Dim lastName As String = row.Item(1)
        Dim firstName As String = row.Item(2)
        row.Item(1) = firstName & " " & lastName
    Next
End Sub

Open in new window


Hope that helps.
0
 
Luis PérezSoftware Architect in .NetCommented:
I think it would be easier if you directly don't add the column to the dataset, so it will be never be shown in the grid.

So, instead of doing SELECT * to fill your dataset, select only the columns you want to show in the grid.

Hope that helps.
0
 
schwientekdAuthor Commented:
The CSV file does not have column names so I'm not sure how I would do that.
0
Cloud Class® Course: Microsoft Office 2010

This course will introduce you to the interfaces and features of Microsoft Office 2010 Word, Excel, PowerPoint, Outlook, and Access. You will learn about the features that are shared between all products in the Office suite, as well as the new features that are product specific.

 
Luis PérezSoftware Architect in .NetCommented:
And how about to remove the column from the DataTable?

MyCommand.Fill(DtSet)
DtSet.Tables(0).Columns.RemoveAt(2) 'Remove the undesired column
gvCensus.DataSource = DtSet.Tables(0)

Hope that helps.
0
 
schwientekdAuthor Commented:
OK, that does work exactly like I asked so I will definitely give you credit for the answer and I very much appreciate the quick responses.  I do however have another problem now.  In this gridview there are a columns for first name and last name.  I was using another sub to combine the first/last names and then want to delete the last name column.  The code you provided deletes the column before I can do this.  Is there a way to remove the column in another sub or should I open a new question.

Again, thank you for you help.
0
 
Luis PérezSoftware Architect in .NetCommented:
Please post your complete code so I can see how are you doing the mixing of names.
0
 
schwientekdAuthor Commented:
Here is the sub I am using to combine names.  I just call it after the code block you have already seen (after the line MyConnection.Close).

    Protected Sub MergeName()

        For Each row As GridViewRow In gvCensus.Rows

            'Combine column 1 and 2 into column 1
            Dim lastName As String = row.Cells(1).Text
            Dim firstName As String = row.Cells(2).Text
            row.Cells(1).Text = firstName & " " & lastName

        Next

    End Sub
0
 
schwientekdAuthor Commented:
That did it.  Thank you!
0
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.

All Courses

From novice to tech pro — start learning today.