Celebrate National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

DataTable select method, how to select with a variable?

Posted on 2004-09-24
9
Medium Priority
?
402 Views
Last Modified: 2008-02-01
Hi,

I have a dataTable, and I would like to select a column by using the string come from my Textbox.

 Dim dt As DataTable = dsDataSet.Tables("CustomerTable")
 Dim row As DataRow = dt.Select("Name =  txtMyTextBox.Text")(0)

However it gives me error for the second line as it is a wrong expression.
I would like to know how to do it properly?

I tried:
= dt.Select("Name =  'txtMyTextBox.Text' ")(0)
= dt.Select("Name =  {txtMyTextBox.Text}")(0)
= dt.Select("Name = " & txtMyTextBox.Text)(0)

but I guess its all wrong........

Please could you tell me the correct method? Many thanks.
0
Comment
Question by:staines
[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 25

Expert Comment

by:RonaldBiemans
ID: 12140889
Sorry but dt.select doesn't return a column but a row

What are you trying to achieve exactly?
0
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 12141042
this works though


Dim dr As DataRow = ds.Tables(0).Select("Firstname = '" textbox1.text & "'")(0)
msgbox dr.item("lastname")
0
 

Author Comment

by:staines
ID: 12144055
Thankyou for your reply.

Dim dr As DataRow = ds.Tables(0).Select("Firstname = '" textbox1.text & "'")(0)

I tried, but couldn't compile it as there is an error ,it said " Comma,')', or valid expression continuation expected" ?

perhaps i should explain abit better?

I want to get the Text from the textBox i created (called "txtMyTextBox"), and look into the dataset table called "CustomerTable", in column called "Name".

Once it found and select that row, i want it to return the item on column say "Lastname" as u did " msgbox dr.item("lastname") "

At the moment i can select the item in the column ONLY if i know what the item is called.
e.g. Dim row As DataRow = dt.Select("Name =  'John' ")(0)
but instead of John, i want the string to be pass from txtMyTextBox.Text

How to do that?

Thanks in advance.
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 12144342
Hi Staines,

could you post your code

because I tested this and it worked. so maybe there is a small typo in your code

0
 

Author Comment

by:staines
ID: 12144762
Dim dr As DataRow = dsDataSet.Tables("CustomerTable").Select("Name= '" txtMyTextBox.Text & "'")(0)

There is a blue underline on "txtMyTextBox", and when u point ur mouse to the blue underline it saids "Comma,')', or valid expression continuation expected"

the rest of code is fine.
0
 
LVL 25

Accepted Solution

by:
RonaldBiemans earned 200 total points
ID: 12144833
oeps, this is correct

Dim dr As DataRow = dsDataSet.Tables("CustomerTable").Select("Name= '" & txtMyTextBox.Text & "'")(0)
0
 

Author Comment

by:staines
ID: 12144837
and also how to avoid program being crash if Select couldn't find the string from txtMyTextBox.Text ?
0
 

Author Comment

by:staines
ID: 12144858
YEP, I see. ! Thank you so much!!!!!
0
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 12144954
just check

if isnothing(dr) then
  msgbox("not found")
else
  msgbox("found")
end if
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

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…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…

730 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