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I m using only one database.
I m using two datasets contained two tables.
Now i want to fetch data from these two datasets in crystal report.
The exception i get is : Unknown query engine
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I have a tab control on the form.
I want to navigate one one tabpage to anoher tabpage.
on tabpage2
on button click event
tabpage(0).show
tabpage(0).focus
It will display the tabpage 1 but not focus it .. means the tab not comes in front.
Any help will be appreciated.
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Try this: tabControl.SelectedIndex = 0;
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Hi, I have two form in vb.net. Each form has one text box and one button. What i want is when i click the button one form one, both text box on the both form display "Hello world". But the code just work for the first line:
text1.text = "Hello world"<br />
form2.text1.text = "Hello world"
The error appear at the line number 2: form2.text1.text = "Hello world"
It seem that text1 is not the control or member of form. I used to use this method in vb6 and it is working, but when I move to vb.net i faced this problem... Does any one has the solution???
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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Forms in VB6 work differently than they do in VB.NET. In VB6, all forms were already instantiated where as in VB.NET, they don't exist untilo your code instantiates them.
You didn't give any details of the errors your getting or the code you used, so about the only thing we can do is point you to an article describing some of the techniques. I'll start with this[^] one on DevCity...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Dear Dave, Thank you very much for your answer. Now I could solve the problem via your supported article.
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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Hey I am creating an employee database and I need some code help  My project needs to have this criteria...if anyone could help me it would be greatly appreciated!!!! Thanx
• Each employee has the following information: Employee ID number, name, hour wage, number of dependents.
• The record for each employee will be kept in a separate file on the file system. (Note, you will need to understand Chapter 9a to create and manipulate files). Each file will have a name like <employee id="">.txt. For instance, if Fred Jones Employee ID is 198, then his filename will be 198.txt
• The record in each file will have the format:
Employee ID
Name
Hourly Wage
Number of Dependents
o For instance, for Fred Jones:
198
Fred Jones
10.15
1
• The Add Employee button will create a new file with the name <employee id="">.txt and add the information from the form in the appropriate format as discussed above if there is an employee ID filled in the employee ID text box. If there is no ID filled in, it should pop up a messagebox with an appropriate error message.
• The ‘Find Employee’ Button will look on the file system for a file named <employee id="">.txt (as desribed above).
o If it finds the file, it will open it and put the information into the appropriate text boxes on the form.
o If it does not find it, it will pop up a messagebox with an appropriate error message.
• The ‘Update Employee’ button will basically resave the employee information in the form back into the appropriate file, including any changes that have been made.
• The Print Employee Button will print the employee’s information in the following format:
Employee Record
---------------------
Employee Name: Fred Jones
Employee ID: 198
Hourly Wage: 10.15
Number of Dependents: 1
• Notice on the printed form that I have used padding to create the column format.
• You are REQUIRED to use Option Explicit On and Option Strict On.
• Use try/catch blocks as is appropriate • Check for the existence of files before you open them.
THANKYOU SOOOO MUCH
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First, it's obvious this is homework. You have to write the code. We won't do it for you. You won't learn much if you don't at least attempt to write the yourself. Everything you need to know you've already covered in class.
Now, when you run into a specific problem, we can help with that.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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This is cross posted in the Visual Basic / VB.NET and SQL / ADO / ADO.NET since I am not sure exactly where it goes. So... lets give this a shot. Background: I am using Access 2000 with extensive Visual Basic coding to handle much of the legwork and raw data manipulation. In the project I have a table with several columns (Say [Info1], [Info2], [Amount1], and [Amount2]). When I open the form it selects all the entries from the table where [Amount1] is less than [Amount2] (I call this a sub set of the table but I am sure there is some big word or funny acronym that is normally used). In the VB code for the form I use Form_FormName.RecordSet.Movefirst / Movenext / Movelast to move around the subset of data and modify it as needed based on what is in [Info1] and [Info2]. This all works fine, but I would like to take all of this data from the subset and put it into a new table in the same database. The new table already exist and has data in it, what I can’t figure out is how to open two different tables in a single form and place data from one table into the other table. It sounds simple, and probably is, but I just can’t seem to figure it out. If anyone could give me a hand or at least get me pointed in the right direction I would greatly appreciate it.
Thanks,
Mark
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First of all, it sounds like you had a similar experience as I did - I entered the DB world after years of programming, and tried to do everything in Access using VBA. It worked, but not always efficiently. Eventually, I ran into problems where I was forced to learn about SQL and DBs. (If this isn't the case for you, excuse me.)
The point of all that is that what you are describing can easily be done with SQL.
First off, if you're looking to select all the records from Table1 where [Amount1] is less than [Amount2], and you don't need to display all the records from Table1, things will run much faster if you write a query in Access for this. If you use SQL view (the easiest for me to duplicate here), the SQL should look like this:
SELECT * FROM Table1 WHERE [Table1.Amount1] < [Table1.Amount2]
For this explanation, save this as DifferenceQuery.
If you only have a few records, you might not notice the speed difference. I am working in a medium sized database (30,000 records or so in the largest table, with 20+ fields in the table), and I quickly noticed the difference when creating my queries in Access rather than using ADO.
Then, in your program, to get the records you want from Table1, use ADO with SQL like:
SELECT [Info1], [Info2], [Amount1], [Amount2] FROM [DifferenceQuery]
This will return the same subset you currently acheive, only you don't have to programatically cycle through the records and select the ones where [Info1] < [Info2].
To place data from this subset into Table2, use ADO & SQL again:
dim info1 as string = "info1"
dim info2 as string = "info2"
dim amount1 as double = 1.1
dim amount2 as double = 2.0
dim sql as string
sql = "INSERT INTO [Table2] ([Info1], [Info2], [Amount1], [Amount2]) VALUES ('" & info1 & "', '" & info2 & "', " & amount1 & ", " & amount2 & ")"
The string concatenation can start to get confusing, but the above would (if I typed it right) produce the sql statement:
INSERT INTO [Table2] ([Info1], [Info2], [Amount1], [Amount2]) VALUES ('info1', 'info2', 1.1, 2.0)
Step through your subset and execute this SQL statement (substituting the appropriate values for your fields) and all your records will be added to table 2.
Hope this helps.
P.S.
I find w3school's SQL tutorials good reference, since I don't use all the SQL commands all the time: Link[^]
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Thank you for your reply. I follow everything you said, and it seems so easy, but maybe I have missed something. The SQL statement which we saved as [DifferenceQuery] is just that, a Query. I have used these a lot but just recently have started looking at the actual SQL statement so I am a little behind. This ends up being saved in the Query section in Access. Where I get lost is the next statement...
"Then, in your program, to get the records you want from Table1, use ADO with SQL like:"
I follow what the line does, but WHERE do I put it? Does this go into a Form in the Form_Load section?
If you find a little time to expand on your info I would greatly appreciate it. Oh... and thanks for the link... I have already started reading.
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i am an engg. student in cs.i want to develop a media on demand web application using vb.net language.
Details:
clients will be provided an gui through which they can select their choices, videos,music etc.options will be provided through which they will be allowed to become members,pay and watch videos , listen to songs etc.
based on their account balances,their permissions will be given.
the database backend is oracle.here, we will be maintaining the various tables. this is simple.
the problem is developing the frontend web application and doing the coding (handling events etc)on vb.net and asp.net as i am totally new to this platform.but i intend to learn that.so, i need help over here.
i have read many tutorials on vb.net.still,i am not able to start.so, if anyone out there has got some similar project already done, pliz help out.if the code is there, it would be of great help.
thanking u!!!!:
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Hi,
If you go to this site:
http://www.wrox.com/WileyCDA/WroxTitle/productCd-0764543865,descCd-download_code.html[^]
You will be able to download code that accompanies an ASP.NET book.
I went through the book and it is pretty good. The sample code that you can download is a site called "The Phile" it is supposed to be a site of video/book/dvd enthusiasts to share information, data, messages, etc. I think it is pretty close, or at least a start for what you need.
It will be very frustrating (I think) without going through a begin to end book of some sort.
Good luck.
Thanks,
-Len Miller
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe."
-Abraham Lincoln
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I’m trying to get the lowlatitude, highlatidude and lowlongitude, highlongitude of an area given the zip code and the radius in miles.
This is what I’ve done but I think it is incorrect.
Anyone has a better calculation?
Thanks,
Martin
Sub SetRadius(ByVal iRadius, ByVal iZip)
Dim rs, SQL, iStartlat, iStartlong, LatRange, LongRange
SQL = "SELECT LATITUDE, LONGITUDE FROM ZIP_CODES WHERE ZIP = '" & iZip & "'"
Dim strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\PROJECT\zipbase.mdb"
Dim Conn = New OleDbConnection(strConn)
Conn.open()
Dim cmdSelect As New OleDbCommand(SQL, Conn)
Dim dr As OleDbDataReader
dr = cmdSelect.ExecuteReader()
While dr.Read()
iStartlat = dr(0)
iStartlong = dr(1)
End While
Conn.Close()
LatRange = iRadius / ((6076 / 5280) * 60)
LongRange = iRadius / (((Cos(CDbl(iStartlat * 3.141592653589 / 180)) * 6076) / 5280) * 60)
LowLatitude = iStartlat - LatRange
HighLatitude = iStartlat + LatRange
LowLongitude = iStartlong - LongRange
HighLongitude = iStartlong + LongRange
end sub
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Ok, I’m not the seasoned programmer but you are at least talking in terms that I am very familiar with. If I read everything correctly, you have center latitude, center longitude, and a radius in miles. I am assuming the following; your Latitude and Longitude are in degree format, i.e. +/- 30.5 and your radius is in statute miles. Since I am use to doing all my calculation in Nautical Miles, I would convert the radius first:
RadiusNM = iRadius / 1.15077945 (1 NM = 1.15077945 statute mile)
Since there are 60 nautical miles in a degree, I would convert the RadiusNM into degree format so it is in the same format as my other data.
RadiusD = RadiusNM / 60
Now that the radius is in nautical terms in degree format, you can simple add and subtract it from your center latitude to get the High / Low latitudes.
HighLatitude = CenterLatitude + RadiusD
LowLatitude = Centerlatitude – RadiusD
For longitude you will need to multiply the distance of your radius in nautical miles by the COS of the center latitude.
HighLongitude = CenterLongitude + (RadiusD * COS(CenterLatitude))
LowLongitude = CenterLongitude - (RadiusD * COS(CenterLatitude))
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Thank you for your reply. I tried your suggestion and I got the same result. I think that my zip code database is incorrect. Here is where I got the DB from : http://www.cfdynamics.com/zipbase/
If I try zip = 33182 and miles = 1 I get 71 zip codes. And if I try zip = 33182 and miles = 12 I also get 71 zip codes.
This is how I get the zip codes:
Private Sub getZip(ByVal LowLatitude As String, ByVal LowLongitude As String, ByVal HighLatitude As String, ByVal HighLongitude As String)
If (LowLongitude.Substring(3, 1) = ".") Then LowLongitude = "-0" + LowLongitude.Substring(1, LowLongitude.Length - 1)
If (HighLongitude.Substring(3, 1) = ".") Then HighLongitude = "-0" + HighLongitude.Substring(1, HighLongitude.Length - 1)
Dim sql = "Select ZIP FROM ZIP_CODES WHERE latitude > '+" + LowLatitude + "' and latitude < '+" + HighLatitude + "' and longitude < '" + LowLongitude + "' and longitude > '" + HighLongitude + "';"
Dim strConn As String
Dim strSQL As String
Dim Conn As OleDbConnection
Dim objDA As OleDbDataAdapter
Dim objDS As New DataSet()
strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\PROJECT\zipbase.mdb"
Conn = New OleDbConnection(strConn)
Try
Conn.Open()
objDA = New OleDbDataAdapter(sql, Conn)
objDA.Fill(objDS, "ZIP_CODES")
Catch ex As Exception
MsgBox(ex.Message)
End Try
Conn.Close()
ComboBox1.DisplayMember = "ZIP"
ComboBox1.ValueMember = "ZIP"
ComboBox1.DataSource = objDS.Tables("ZIP_CODES")
MsgBox(ComboBox1.Items.Count.ToString) ‘display the # of zip found
End Sub
THANKS AGAIN,
MARTIN
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Do you know where I can get another DB just like the one I'm using?
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Have you stoped in the middle of this and checked to see what High / low Latitude and Longitude you are sending in the SQL statement. Since you know what the Latitude and Longitude of the zip is (33182 Lat 25.7802 & Long -80.4182), and you know what the distance is, you should know what the high and lows should be (High lat 25.7946 and low lat 25.76571). Seems pretty simple... BTW... Miami has 134 records that come up if you check for zip codes at zip-codes.com.
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I did stop and checked the high and low Latitude/Longitude and all 4 look fine, but I get the same result with a radius of 1 mile and a radius of 12 miles. I think the DB I'm using is wrong. Do you know where I can find another zip code DB?
Thanks again,
Martin
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Hey all,
Just wondering how to go about accessing and reading data from a remote (on a webserver) xml file. Thanks
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Look for information on how to create xml web services. An xml web service is just another class library (dll) that resides in a remote web server. All the methods declared in the xml web service return xml formatted data.
After you create a web service dll and place it in a remote web server, you can create windows app and when you right click on "References" on solution explorer, select "Add Web Reference" and just set the reference to the xml service you created (similar to setting reference to a dll in your hard drive).
After you set a reference to your xml web service, you should be able to create an instance of any class in your web service and you should be able to call any methods that have [WebService] defined in front of the method. Note that you probably want to call methods asynchronously due to slow response over internet, so look for information in it. VS automatically creates methods that can be called asynchronously and you just pass a callback function to let you know when it's done.
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Thanks for the help. I'll be looking into it. Cheers
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Hi there,
I have problems with DSOFile 2.0 from Microsoft.
I have downloaded the component from the Microsoft Homepage and tried the sample (VB 6.0).
When I tried to change the document title of a document containing a title, everything worked fine.
When I tried to "create" the document title, I get an "access denied". With the same file within explorer I can set the document title and afterwards I can change it through DSOFile.
Is there any known restriction that I have to create the title manually to use DSOFile?
tia
Sebastian
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You DO know this is a sample project to demonstrate how to use the IPropertySetStorage and IPropertyStorage interfaces, don't you? It's NOT production quality code, NOT supported, and NOT guaranteed to do anything!
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi Dave,
yes I DO know that this is a sample, that it is not supported...
I think it should be ok to ask why a given sample does not work as expected because there are only a few methods so I dont have a chance to do something different...
I have not found any information on how to set the document title except this component and this is not working. Maybe I do something wrong but it would be nice if someone can tell me what to correct...
tia
Sebastian
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