?
Solved

vb.net datatable .clear method issue

Posted on 2011-09-02
9
Medium Priority
?
662 Views
Last Modified: 2012-06-22
So i am trying to clear a datatable using the .clear() method for the table.

The issue i am running into is even though the table is cleared and there is no data in it i am getting an exception when i try to add data back into it.

Column 'DelayId' is constrained to be unique.  Value '2440' is already present.

so it seems like there is data already there, but when i check the row count before this code is executed it is 0. also i have tried .AcceptChanges() after the clear and it doesnt seem to make a difference.

I must be missing somethign stupid. Please help Thanks
0
Comment
Question by:michael_krell
[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
  • 5
  • 4
9 Comments
 
LVL 17

Expert Comment

by:nepaluz
ID: 36472700
try calling the reset method, i.e
Dim cv As DataTable = New DataTable("MES")
cv.Reset()

Open in new window

0
 

Author Comment

by:michael_krell
ID: 36472712
I believe when i did that it killed everything. meaning my columns were gone as well.
0
 
LVL 17

Accepted Solution

by:
nepaluz earned 2000 total points
ID: 36472726
Dim cv As DataTable = New DataTable("MES")
cv.Rows.Clear()
cv.AcceptChanges()

Open in new window

0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:michael_krell
ID: 36472738
I have tried that.... sorry
0
 
LVL 17

Expert Comment

by:nepaluz
ID: 36472747
Hmmm!! Be right back. (would help if you show some code on how the table is set up)
0
 

Author Comment

by:michael_krell
ID: 36472905
This is the code for how the table is setup
With PopStartIDs
            .TableName = "PopStartIDs"
            .Columns.Add("DelayId")
            .PrimaryKey = New DataColumn() {.Columns("DelayID")}
            .Columns("DelayId").Unique = True

        End With

Open in new window

0
 

Author Comment

by:michael_krell
ID: 36473277
ok. so i may have figured it out.......

Looks like i was doing some stupid stuff with the data i was loading into it....
0
 
LVL 17

Expert Comment

by:nepaluz
ID: 36474941
stranger things have happened I suppose .... care to share so we can avoid the same?
0
 

Author Comment

by:michael_krell
ID: 36483757
Nothing complicated. I had a dataset that I was filling with data and using a dataadapter and .fill method. Whenever that code ran it added new records instead of replacing. I just cleared the table in the SQL dataset before running the .fill
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

Introduction When many people think of the WebBrowser (http://msdn.microsoft.com/en-us/library/2te2y1x6%28v=VS.85%29.aspx) control, they immediately think of a control which allows the viewing and navigation of web pages. While this is true, it's a…
It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…
Suggested Courses
Course of the Month12 days, 15 hours left to enroll

777 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