How to check validation in vb.net

Question

0.00/5 (No votes)

See more:

Hi Everyone,

For my project I have to check the validation whether the scanned barcode is present in first_table, and, if present then you can proceed if not present then its not allowed.

Please help me for this. Here is the code.

VB

Try
 cn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source = C:\Users\Mil-Dev2\Documents\Visual Studio 2008\Projects\Project-1st\Project-1st\Mercedez_benz.accdb"

 cn.Open()
 selct = "Select * from Job_card_opening where Sequence_Code=(Select Max(Sequence_Code)as MaxSeqNo From Job_card_opening where Barcode_Number='" & TextBox3.Text & "')"

 dadapt = New OleDbDataAdapter(selct, cn)
 dadapt.Fill(ds, "Job_card_opening")

 If ds.Tables("Job_card_opening").Rows.Count = 0 Then
 ins = "insert into Job_card_opening (UserName,Designation,Barcode_number,IN_Time,Transaction_Completed) values ('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "','" & Now & "','0')"

 cmd = New OleDbCommand(ins, cn)
 iicount = cmd.ExecuteNonQuery
 MessageBox.Show("Data Inserted")
 TextBox3.Text = ""
 ds.Dispose()
 Else
 Dim selData As String = "Select max(Sequence_Code) from Job_card_opening where Barcode_number = '" & TextBox3.Text & "'"

 Dim dap As OleDbCommand
 dap = New OleDbCommand(selData, cn)
 count = dap.ExecuteScalar
 Dim Selctquery As String = "Select * from Job_card_opening where Sequence_Code = " & count & " and Barcode_Number = '" & TextBox3.Text & "'"

 Dim dsfinddata As New DataSet
 Dim dapselcet As New OleDbDataAdapter
 dapselcet = New OleDbDataAdapter(Selctquery, cn)
 dapselcet.Fill(dsfinddata, "Job_card_opening")
 If IsDBNull(dsfinddata.Tables("Job_card_opening").Rows(0).Item(4)) = False And IsDBNull(dsfinddata.Tables("Job_card_opening").Rows(0).Item(5)) = False Then

 ins = "insert into Job_card_opening (UserName,Designation,Barcode_number,IN_Time,Transaction_Completed) values ('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "','" & Now & "','0')"

 cmd = New OleDbCommand(ins, cn)
 iicount = cmd.ExecuteNonQuery
 MessageBox.Show("Data Inserted")
 TextBox3.Text = ""
 ds.Dispose()
 ElseIf IsDBNull(dsfinddata.Tables("Job_card_opening").Rows(0).Item(4)) = False And IsDBNull(dsfinddata.Tables("Job_card_opening").Rows(0).Item(5)) = True Then

 mstrscanId = "update Job_card_opening set OUT_Time = '" & Now & "',Transaction_completed = '1' where Barcode_number = '" & TextBox3.Text & "' and OUT_Time is null"

 cmd = New OleDbCommand(mstrscanId, cn)
 count = cmd.ExecuteNonQuery
 MessageBox.Show("Updated Out_time")
 TextBox3.Text = ""
 ds.Dispose()
 End If
 End If
 Catch ex As Exception
 MsgBox(ex.Message)
 End Try
 cn.Close()

Thanks in advance,
Saumya

Posted 11-Jan-11 18:56pm

Saumyavemula

Updated 11-Jan-11 21:33pm

Dalek Dave

v3

Add a Solution

Comments

Baji Jabbar 12-Jan-11 1:21am

Can u please provide comments in the code in order to get a better understanding. On the first look there I noticed some logical mistake, it might be my mistake , your comments on the code will give a good understanding of your logic

Dalek Dave 12-Jan-11 3:33am

Edited for Grammar.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

benson ndirangu · Answer 1 · 2011-01-11T20:36:00

If you are checking wheather it exists then change to this code.
When youu use greater than then it means even if the record are more than one the result with still be the same

SQL

If ds.Tables("Job_card_opening").Rows.Count > 0 Then
 ins = "insert into Job_card_opening (UserName,Designation,Barcode_number,IN_Time,Transaction_Completed) values ('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "','" & Now & "','0')"

Please comment your code for ease understanding