I am trying to check whether username entered by user is already exist or not in database. But, I dont know how. The codes are below.
If TextBox3.Text = TextBox4.Text Then
Dim conn As New SqlConnection()
Dim cmd As New SqlCommand()
[Code].....
I'm doing an application to manage a school of music, at the moment i'm working on registration (with MySQL DB).
Imports MySql.Data.MySqlClient
Public Class Admin_Reg
Dim server As String = "Server=localhost;Database=escola_musica;Uid=root;Pwd=;"
[Code].....
Now i want to verefy the table if the username exists or not. If it exists msgbox "Registration Complete", if not "Username already exists. Choose another one..."
I am having a problem that dtAsia.rows.count>0 doesn't count at all. All I want to do is tell the user that their username already exists in the game but I'm having a bad time now because for example: I entered a valid username and its success... I entered an invalid username and got the CATCH part of this code.. So if i entered a valid username again. I still got the CATCH part of the code until the end even if I enter valid or invalid username still got the CATCH part.
If (dtAsia.Rows.Count > 0) Then ' wont work
MsgBox("Username: " & Trim(txtUsername.Text) & " is already exist.", MsgBoxStyle.OkOnly, "Message :")
[Code].....
I am trying to write(what I thought would be a simple piece of code. I was wrong.
What I am trying to do is to get an application to check if a file exists, However, I have it wrong as the file obviously does exists, but when I run the application it tells me it does not.
Imports System.IO
Public Class check
Dim checkfile As New FileInfo("C:\HelloWorld")
[Code].....
I'm using then next method to check if a directory exists but it seems it doesn't work.
[Code]...
im trying to make code to check if a file with the same name exists twice in the same dir one with .dds and one with .veh file extentions and if they do put in a listbox but if only one exists then it puts it in another listbox i have made code to filter .dds in to one listbox and .veh in another but i dont know how to make the "check" if they are both there
this is the code i have to split them at the mo
For Each files In dir
Dim path() As String = files.Split("\")
Dim chunk As Integer = path.Length
[Code]....
but i wanted the Else for the .dds files that dont have the matching .veh file
I think this is a really simple question to answer but I can't find a better solution. Basically I am importing data from an external source and as I go through importing each for I am doing a for loop to see if the row already exists; this is taking a life time and I feel it is a very simple way of doing it. Is there a better way to see if a row already exists using specific columns and key indexes?
View 5 RepliesI'm using ADO.Net to work with an Excel Document. Essentially, I'm looking up values in a table called "source" and creating a new table called "result" which will be populated with the results of my query.
I have a couple of questions.A) How can I check if a table exists and create a new one if it doesn't? B) Is a table the same as a sheet in Excel?[URL]...
I haven't used System.IO before, and I'm a little stuck.I need to check if a file exists, for example C:Documents and SettingsverraineDesktopSURNAME Firstname v1.docx, if this file exists the filename has to become v2, and so on. Usually there will only be a v1, but in the case that a clients position changes we have to be able to save the new version without overwriting the old one.
How would I be able to do this efficiently? I'm uncertain to say the least. Because, if I manage to find out how to save the file as a different number, that's alright, but if that next number exists as well? I can only think of ways to do this that require a lot of code.
i have a checkbox on a form, which is of type boolean in the database .when the user check the checkbox, before the data enters the database, the program should check if there exists already a "1" on the database for this field.If so the user is not allowed to check the depot.
View 5 RepliesCompletely new to ASP.net
Page Language="vb"
Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.3082
I want to check on the server for the existence of an image, then if it does exist, display the image wrapped in other code. E.g.
if "/images/name.jpg" exists then
<div><img src="/images/name.jpg"></div>
else
Do nothing.
Seems really simple to me but NOTHING I have tried has worked (compilation errors). I've tried examples using system.io, DIM stuff with 'FileInfo', Set fs. FileInfo examples produce 'not defined' errors, 'Set' says it's outdated and not used anymore and so on.
I want to check if an Outlook folder exists, if it doesn't then create it & if it does then carry on with other code. I can create the folder as a sub folder of the Inbox but once it is created I get an error because it is still looking to create when it's already created. I have tried to capture the error but still no joy.
[Code]...
I am having a ton of trouble trying to check if a record exists. I continue to get a data mismatch on my command.ExecuteScalar().
Code:
Protected Sub btnRegister_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnRegister.Click
[code].....
I've created the following function and thrown it inside of a timer:
[code]...
It works, but it keeps trying to open media player for each process it looks like. I need to continuously run the function so that Media Player opens when it's closed.how to make sure it opens only once when the process doesn't exist?
I'm checking is a file exists as follows.
If txtGradeObs.Text = "" Or Dir(txtGradeObs.Text) = "" Then
MsgBox("Specify the Grade job of Obstructions", vbExclamation, MsgBoxTitle)
Exit Sub
End If
I get an error if the drive does not exist - i.e. G: rather than C:. It used to work in VB6. How can I get it to work.
I had created login form in vb.net. There are two fields username & password. I want to check username & password enter in the login form, from the first.mdf (database file). If it is correct then message is displayed. I had written code for this but I got error in the code.
The code of login form is below:
Imports System.Data.SqlClient
Imports System.Data.SqlClient.SqlConnection
Imports System.Data.SqlClient.SqlCommand
Public Class Login
Inherits System.Windows.Forms.Form
[Code] .....
I'm trying to download files using the Net.WebClient call to DownloadFile
Using client As New Net.WebClient()
[code...]
Is there a polite way I can ask for the file instead of calling DownloadFile, and handling the exception ?
I am adding the text of a label into a datagridview. But before i do the insert, i want to check if the text does not already exist in the datagridview.
View 1 RepliesI have been on MSDN about this and searched but it's not quite telling me what I'm after. I've extracted a list of file names from an Excel spreadsheet and want to check whether they all exist in a directory which a user can select in a text box. It feels like I'm nearly there with it but currently my listbox is displaying everything, I want it to just show the files that are missing. I'm a beginner so I'm not exactly sure if I'm even telling it to compare the two things properly, I've tried a couple of ways of checking if a file exists but neither seem to work.[code]
View 1 RepliesI making an "sign in" application for checking email address with username and password as input.As output it will show me msgbox with content "Your email and password are correct!" or Not.There is a code:
Code:
Imports System.Net.Mail
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click[code].....
I making an "sign in" application for checking email address with username and password as input.As output it will show me msgbox with content "Your email and password are correct!" or Not.
[Code]...
I making an "sign in" application for checking email address with username and password from textboxes,and receiving message do username and password are correct or not.There is a code & image:
Imports System.Net.Mail
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Declare variables
[code].....
send a solution for this "update login SET password=@password,username=@username where username=@user"
while executing i got the error"syntax error in update statement "
The program is for users to submit their username by typing in their username and pressing the submit button. The username may be able to display on the Usernamelabel in form1.(I made the button on form2) I have problems coding to make the text to come out in form2.My code comes out as error.
Here is the code in form2.
Public Class Form2
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[CODE]...
Is there any better performance by checking for a true value like this:
[CODE]..............
Than like this:
[CODE]..............
I'm making a basic FTP chat for me and my friend, how would I make it so the people can't use the same username? I don't know how to use databases..
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I want to get the username of remote machines from the IP address.Right now I can only get the domain name,computer name and Mac address of Remote system from IP address but not the name of the person whom it belongs.We use Windows 7 as OS.
View 4 Repliesi have two text boxes
1)username
2)Password
i have a little confusion, when we execute the form by entering the username and password it will execute no problem but when we execute for the i want the same username should be written which has been used in the previous execution?
Get XP UserName in VB2008 Express
View 2 RepliesI have program here which user are able to submit username and can be displayed.Currently I made 2 forms. Form2 is the submit form where the user can type in their username and press the submit button; Form1 has a label in it which displays the username.the Problem I have now is that I created another button in form1 which enables users to change their username by reopening form2. But the submit button doesn't work,the username is still the same.Here is what i Have done:
form1 codes
Private Sub form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim frm2 As New Form2()
[code]....