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If you execute one after the other, both would add rows to the datagridview. There is no .Clear() visible in your code, so one would assume it to be appended.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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before i remember i do it like that but now many time trying without a solution
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Dim ouvrir As New OpenFileDialog
If ouvrir.ShowDialog = DialogResult.OK Then
Dim aline() As String
Dim sr As New StreamReader(ouvrir.FileName)
While Not sr.EndOfStream
Dim ligne As String = sr.ReadLine
aline = ligne.Split(CChar(vbTab))
DataGridView1.Rows.Add(aline)
End While
cn.Open()
Dim cmd As New SqlCommand("select * from F_COMPTET", cn)
Using da As SqlDataReader = cmd.ExecuteReader
While da.Read
DataGridView1.Rows.Add(da("CT_Num"))
End While
End Using
There's only "adding" done to the rows, so both should be visible if you execute this.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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thats not work and as i told you before i tested it and didnt work
it show the data above eatch other always
because of comun selected
in
DataGridView1.Rows.Add(da("CT_Num"))
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In the first block of code, you add an array of Strings. You should add a string-array of similar size in the second block.
DataGridView1.Rows.Add(Convert.ToString(da("CT_Num")).Split(CChar(vbTab)))
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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its always takes first column
like this datagridview.rows.add(column1,column2,column3...)
in first place when read textfile with split it take many column but when with database it take always first column
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Yes, because that's the only column you read from the database.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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but its filled from textfile
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It is filled with an array of strings from the first text-file. Then you only select one column from the database.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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If it's not "delimited" (for columns), your best choice is to load "lines", one line at a time, into a column templated as a TextBlock, with TextWrapping turned on.
Load the strings into a list and assign the list to the grid's data source.
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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my problem not in import or reading
my problem is i can manage to add a column for importing data from database always take same column in datagrid that occupied from textfile
i need something like this (column1 from textfile,column2txt,column3txt,column4 from database)
or (column1 from database,column2txt,column3txt,column4txt)
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Then, how are the 2 related?
You can read one "data source" then "link" to the other via "something in common"; e.g. a "key".
Then the 2 can be combined.
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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how i can do that , this the idea i looking for
import from text file link it to something datatable for exemple
after import from database link it to same that linked before from textfile
after add it to datagridview
please help me this the idea i looking for
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You're implying you don't know the contents of your data and how they relate.
That's like saying you don't know your own name or color of your eyes.
You need to "study your data" or ask some one why you are doing what you are doing.
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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i need to know how to relate 2 datatable with bindingsource
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Problem:Cannot get directory list for "C:\Users\Public\Public Documents" which
on my system contains "C:\Users\public\public Documents\Hewlett-Packard"
I hope I am not making some silly error again.
Have tried to use SHGetKnownFolderPath("{ED4824AF-DCE4-45A8-81E2-FC7965083634}") ' PublicDocuments
which returns this path: "C:\Users\Public\Documents".
When I use Directory.GetDirectories("C:\Users\Public\Documents") it returns these
folders:
"C:\Users\Public\My Music"
"C:\Users\Public\My Pictures"
"C:\Users\Public\My Videos"
and
"C:\Users\Public\Hewlitt-Packard"
This last one is the one I'm trying to get from "Public Documents"
It is actually in "C:\users\Public\Public Documents\Hewlitt-Packard" as shown in explorer.
The problem is I have no way of knowing which one of the above folders is
in "C:\Users\Public\Public Documents"
Trying to manually get this way:
Below is code with errors.
Dim s As String
Dim files() as String
s = "c:\Users\public\public documents" ' Error - Could not find part of the path.
' or this from google search add double quotes.
's = String.Format("{0}c:\Users\public\public documents{1}", Chr(34), Chr(34)) ' Error - Illegal chars in path
files = Directory.GetDirectories(s)
What am i doing wrong?
Thanks
-- modified 6-Apr-19 16:39pm.
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Quote: What am i doing wrong?
Nothing. Explorer uses various link names as aliases to real directories. What you have is correct.
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speedbump99 wrote: s = "c:\Users\public\public documents" ' Error - Could not find part of the path.
"C:\Users\Public\Documents"
Not "public documents" onder "public", that's redundant.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Hello !
I'm using vb.net 2017 and Entity Framework 6 with sql server 2008r2.
I have 2 tables in database :
Studnets: (ID , Name )
Status : (ID , Year , Student_ID , Active )
The table status has the status of students in a specific year. A student may have 0 or 1 status on a year . ( If a student has not a status on a year , the last status from previous years ( if exists ) is used as a status for it this year)
Now I want to have a query that load on local cache only the students that are active on a specific year.
This is my query :
Dim queryv As IEnumerable(Of students)
queryv = (From t1 In context.students order by t.Name select t)
queryv = (From t1 In queryv
Let p = t1.status.Where(Function(t2) t2.year<=year1).OrderBy(Function(t3) t3.year).LastOrDefault
Where Not IsNothing(p) AndAlso p.active = True
Select t1)
queryv.Tolist
On Database there are 2 students , one of them has an Active status this year , the other has a non-active status.
The problem is that after i excute that query , i have 2 instructions , just for testing :
Messagebox.show(queryv.count)
MessageBox.show(context.studnets.local.Count)
The results are :
1 (for queryv)
2 (for local cache )
On Local cache both students exists.
Why is this result ?
Thank you !
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IEnumerable(Of students) queryv = (From t1 In context.students order by t.Name select t) Since you've stored this result in an IEnumerable(Of students), all students will be loaded from the database into the local cache when you iterate the results. The second query will then execute against the local cache.
If you only want to load the matching students into the local cache, then either use a single query:
Dim queryv As IEnumerable(Of students)
queryv = (From t1 In context.students
Let p = t1.status.Where(Function(t2) t2.year <= year1).OrderBy(Function(t3) t3.year).LastOrDefault()
Where Not IsNothing(p) AndAlso p.active = True
order by t1.Name
Select t1).ToList() or change your queryv variable to be IQueryable(Of students):
Dim queryv As IQueryable(Of students)
queryv = From t In context.students order by t.Name select t
queryv = From t1 In queryv
Let p = t1.status.Where(Function(t2) t2.year<=year1).OrderBy(Function(t3) t3.year).LastOrDefault
Where Not IsNothing(p) AndAlso p.active = True
Select t1
Dim results As IEnumerable(Of students) = queryv.ToList()
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I've tried your solutions , and both produced the same error :
LINQ to Entities does not recognize the method 'Program1.status LastOrDefault[status](System.Collections.Generic.IEnumerable`1[Program1.status])' method, and this method cannot be translated into a store expression.'
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That error message means "LastOrDefault" isn't translatable to an SQL query. There is no SQL equivalent function for it.
You're going to have to rewrite your query to work without LastOrDefault.
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I have used LastOrDefault in other cases , and there were no problems translating in SQL Query.
so I think there is a SQL equivalent for LastOrDefault.
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Allow me to rephrase. That error message says the method isn't supported by the whatever the underlying provider is.
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ok , but what's wrong with my query , and what should I do ?
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