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Connection strings to Access database. Taken from www.connectionstrings.com!
Standard security:
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;User Id=admin;Password=;"
Workgroup (system database):
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;Jet OLEDB:System Database=system.mdw;"
With password:
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;Jet OLEDB:Database Password=MyDbPassword;"
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I am a beginners in dotnet.
I have one datagrid.Retrieve the data from the db and bind into a datagrid.
Now i want to edit and update the data in a datagrid.
And also filter the records in a grid based on some conditions.
how its possible any one know this plz helpme.
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As far as filtering goes try using as DataView for your Datagrid.
Make sure the DataGrid is not set to readonly.
If your using a DataAdapter to retrieve data, verify there is an Update command defined, then use the Update method to write back to the database.
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hi
i want to know what is the difference b/w socket programming in desktop and on the pda. the ports are same or the pda had not ports for socket programming .
ddd
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There is no difference. Sockets are sockets are sockets. Berkley is pretty much a standard implementation.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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ok u mean that socket programming is possible in pda and sockets present in the desktop ie 1024 onward are also present in pda.
ddd
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Hai i am beginners in dotnet.I want to add toolbar in datagrid using vb.net and also add edit delete operation are done in datagrid.
I need some suggestion abt this.
Any one know send reply to me
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How can I use the OpenFileDialog or CloseFileDialog dialogs to select a floder but not a file (like we did with DirList in VB6)?
Thanks
James
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Hi guy's
Does any body can help me please ? I have created an Visual Basic.Net Application and in my application there is one form which was contains crystal report viewer that form called Report Form, At the first time when I run this program in my PC everything was OK, but after I created Setup disk and install it into another PC , I got errror message " Load Report Failed " every time I run That Report form.
I don't know how it come and what should I do to fixed it. I really need your help to solve my problem.
Thank you
Best regards
I C E
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1. Did you include the report in the installation?
2. Is the report sitting in the directory where your code expects it to be?
3. Is your code generating the correct full path to the report file or did you just assume that the current directory would be your applications directory?
BTW, #3 this is the most popular mistake in using any file! Always generate full pathnames to any file you use. Never(!!) assume that the current directory will be what you set it to, or assume it to be, at any time! I can't stress this enough!
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have a recursive query which fetches a heirachy for me. now i want to show that heirachy in a tree view.
The problem in showing it in a treeview is that it is adding only one child in the parent. If there child itself is a parent then a new node is created instead of adding it in the existing node.
like this
1->2
2->3
3->4
4->5
and i want something like this
1->2->3->4->5
Can anyone Help?
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Post the code that populates the TreeView. You're not properly tracking which node your adding children too.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have solved it Here's the code:
Protected Function RecursiveQuery(ByVal ParentID As String)
Dim strSelect As String
strSelect = "select R.RE_Child,D.RE_entities_Name as Child from Relation_Detail R,Relation_Master D where R.RE_Child=D.Relation_Master_code and RE_Parent='" & ParentID & "'"
Dim con As SqlClient.SqlConnection = New SqlClient.SqlConnection("workstation id=localhost;packet size=4096;user id=sa;data source=localhost;persist security info=False;initial catalog=Test")
Dim sqcmdRecursive As SqlCommand = New SqlCommand(strSelect, con)
Dim strParentID As String
Dim strChildID As String
Dim sqrd As SqlDataReader
Dim tvCreate As TreeNode
Try
If con.State = ConnectionState.Closed Then
con.Open()
End If
sqrd = sqcmdRecursive.ExecuteReader
While sqrd.Read
arParent.Add(ParentID)
strChildID = sqrd.Item(0)
If ParentID.Equals("0") Then
ParentNode = New TreeNode(ParentID).Nodes.Add(sqrd.Item(1))
ParentNode.Tag = sqrd.Item(0)
PasteImages(ParentNode, sqrd.Item(0))
TreeView1.Nodes.Add(ParentNode)
ElseIf shFlag = 1 Then
ParentNode = New TreeNode(ParentID)
Dim NewNode As TreeNode
NewNode = New TreeNode(sqrd.Item(1))
NewNode.Tag = sqrd.Item(0)
PasteImages(newnode, sqrd.Item(0))
Add2Node(TreeView1.Nodes, ParentNode, NewNode)
Else
ParentNode = New TreeNode(ParentID)
Dim NewNode As TreeNode
NewNode = New TreeNode(sqrd.Item(1))
NewNode.Tag = sqrd.Item(0)
PasteImages(newnode, sqrd.Item(0))
Add2Node(TreeView1.Nodes, ParentNode, NewNode)
End If
RecursiveQuery(sqrd.Item(0))
End While
Catch ex As Exception
MsgBox(ex.ToString)
Finally
con.Close()
shFlag = 1
End Try
End Function
Private Function Add2Node(ByVal TestNode As TreeNodeCollection, ByVal findnode As TreeNode, ByVal newnode As TreeNode) As Boolean
Dim n As TreeNode
For Each n In TestNode
If n.Tag = findnode.Text Then
n.Nodes.Add(newnode)
Add2Node = True
Exit Function
End If
Add2Node(n.Nodes, findnode, newnode)
Next
End Function
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I have solved the problem. Here's the code:
Protected Function RecursiveQuery(ByVal ParentID As String)
Dim strSelect As String
strSelect = "select R.RE_Child,D.RE_entities_Name as Child from Relation_Detail R,Relation_Master D where R.RE_Child=D.Relation_Master_code and RE_Parent='" & ParentID & "'"
Dim con As SqlClient.SqlConnection = New SqlClient.SqlConnection("workstation id=localhost;packet size=4096;user id=sa;data source=localhost;persist security info=False;initial catalog=Test")
Dim sqcmdRecursive As SqlCommand = New SqlCommand(strSelect, con)
Dim strParentID As String
Dim strChildID As String
Dim sqrd As SqlDataReader
Dim tvCreate As TreeNode
Try
If con.State = ConnectionState.Closed Then
con.Open()
End If
sqrd = sqcmdRecursive.ExecuteReader
While sqrd.Read
arParent.Add(ParentID)
strChildID = sqrd.Item(0)
If ParentID.Equals("0") Then
ParentNode = New TreeNode(ParentID).Nodes.Add(sqrd.Item(1))
ParentNode.Tag = sqrd.Item(0)
PasteImages(ParentNode, sqrd.Item(0))
TreeView1.Nodes.Add(ParentNode)
ElseIf shFlag = 1 Then
ParentNode = New TreeNode(ParentID)
Dim NewNode As TreeNode
NewNode = New TreeNode(sqrd.Item(1))
NewNode.Tag = sqrd.Item(0)
PasteImages(newnode, sqrd.Item(0))
Add2Node(TreeView1.Nodes, ParentNode, NewNode)
Else
ParentNode = New TreeNode(ParentID)
Dim NewNode As TreeNode
NewNode = New TreeNode(sqrd.Item(1))
NewNode.Tag = sqrd.Item(0)
PasteImages(newnode, sqrd.Item(0))
Add2Node(TreeView1.Nodes, ParentNode, NewNode)
End If
RecursiveQuery(sqrd.Item(0))
End While
Catch ex As Exception
MsgBox(ex.ToString)
Finally
con.Close()
shFlag = 1
End Try
End Function
Private Function Add2Node(ByVal TestNode As TreeNodeCollection, ByVal findnode As TreeNode, ByVal newnode As TreeNode) As Boolean
Dim n As TreeNode
For Each n In TestNode
If n.Tag = findnode.Text Then
n.Nodes.Add(newnode)
Add2Node = True
Exit Function
End If
Add2Node(n.Nodes, findnode, newnode)
Next
End Function
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I have an existing form I created from vb studio and I am working on how to update and fill an access database from the text fields when the user clicks the submit button. Help please
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This is such a common task, that I doubt you'd have any trouble searching google for articles on it.
Christian Graus - Microsoft MVP - C++
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VB6, VB.NET (1.0 or 2.0)?
In any case the official documentation on CD (or MSDN on-line) has plenty of examples and ready to use code about that.
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I need code for creating a TCP/IP communication inside visual basic adding the Winsock control so that you acan chat on a port
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Try searching this site or Google for code. It's amazing what you can find if you try.
...Steve
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I am looking to implement a text editor functionality Using VB.NET in ASP.NET that allows for the following:
1. If any text or number is changed, it gets "striked Out" but never over written ever.
2. If anything is deleted, it gets striked out as well.
I can use RTF editor (example R.A.D editor from Telerik)to let user enter information for the first time. Next time when they change or deleted, I need to implement the strike out feature.
Any ideas, and suggestions will be greatly appreciated.
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Basically want you want to do is, during postback, work out what has changed, and then send it back with a strikeout through the old document. So, the main thing you need is to write code to difference the document you sent to the user, and the document they submitted back.
Christian Graus - Microsoft MVP - C++
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I'm trying to decide the best way to setup my DataTables and DataAdapters.
Which way is the best way?
1. Use the DataAdapter wizard and have separate DataTables and DataAdapters for each form in the project.
2. Define public DataTables and DataAdapters in a module so that these objects are available to all forms.
Thanks for any input.
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dptalt wrote:
Use the DataAdapter wizard and have separate DataTables and DataAdapters for each form in the project.
This way is crap. I take it this means you're not even implimenting a middle tier ?
dptalt wrote:
Define public DataTables and DataAdapters in a module so that these objects are available to all forms.
Yes, what should happen is that you have a seperate module that handles data access, and returns the required data to the middle tier. That way, your data layer is seperate from the rest of the app.
That Microsoft provides DataAdapters at all is a travesty, IMO. Assuming you're using a real database, you should write your database code as stored procedures, and your data layer should call those procs and return the result. Putting SQL generation in the hand of a wizard, and passing SQL statements like select and update to the data layer from the application layer is just crap, unless the apps your writing are just for fun, or at least will run on one machine with a local database. It's still not the right way to architect things tho.
Christian Graus - Microsoft MVP - C++
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Ok, Thanks for the advice.
I do think the DataAdapter wizards are great for the beginner.
Do you use DataAdapters in your middle tier? If not what do you use?
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