Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Problem adding a column to a DataTable on second occurence of New DataTable()

Posted on 2006-10-25
2
Medium Priority
?
257 Views
Last Modified: 2010-04-23
Hello,

Here's my sequence

Public Class frmMain
    Inherits System.Windows.Forms.Form

    Private dsADP As New DataSet
    Private tblTA_ADP_Hrs As DataTable

.....

    Private Sub BindData()

'fill table with sql statement

   daADP.SelectCommand = New Odbc.OdbcCommand(sSQLTA_ADPHrs, dcADP)
            daADP.Fill(dsADP, "tblTA_ADP_Hrs")

......

'Add column to table

Dim dcHours As New DataColumn
                dcHours.DataType = System.Type.GetType("System.Double")
                dcHours.AllowDBNull = True
                dcHours.ColumnName = "Regular_Hours"
                dsADP.Tables("tblTA_ADP_Hrs").Columns.Add(dcHours)             (this is the line it dies on second time through)


This column adds fine, but if I run my program a second time (fill a datagrid and create csv file) and then attempt to BindData() again it fails when trying to add this column.  I have a Try - Catch loop that dumps out to my error string.

At the end of my create file routine, I'm trying to "refresh" all tables, relations, and columns but still get error.  I have a feeling it thinks the column is already there??

dsADP.Tables("tblTA_ADP_Hrs").Rows.Clear()
        dsADP.Tables("tblTA_ADP_Hrs").Dispose()
        dsADP.Relations.Clear()
        dgJBTimeAttendance.Refresh()


Any thoughts would be greatly appreciated.

Thanks,
JMO9966

0
Comment
Question by:JMO9966
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 10

Accepted Solution

by:
gangwisch earned 1000 total points
ID: 17807015
it's because you can not have two of the same columns named the same thing. this is the line that is killing you
dcHours.ColumnName = "Regular_Hours"
maybe you can try doing a  dsADP.Tables("tblTA_ADP_Hrs").Columns.remove("Regular_Hours") before adding
0
 

Author Comment

by:JMO9966
ID: 17807107
Thanks Gangwisch!!
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …

636 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