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You will probably want to be able to update some value of some field when doing database programming. This is done with Edit and Update. We will try to change the value of the "Phone" field by editing the text in the text box
and clicking a button.
Put a command button on the form and name it "cmdUpdate". Then copy the following code to the project.
Private Sub cmdUpdate_Click()
Could it be that simple? Yes. This changes the phone number of our
selected person. Or to put it technically: This changes the value of the
"Phone" field of our current record. Imagine the current record being a
set of boxes, with a field in each box. T
he Edit method takes the lid off all of the boxes and Update puts them back on. When we write rsMyRS!Phone = txtPhone.Text we replace the content of the "Phone" box with the content in the text box.
When you're entering information into a text box and press <Enter>, you'll hear a beep. You can easily avoid this behavior. To do so, place a text box on your form (Text1). Enter the following code in the KeyPress event:
Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
KeyAscii = 0
Dim allows you to declare a variable. It is short for "Dimension", and is an old old keyword. For example if you want to declare a variable called i that can hold an integer you would write:
Dim i As Integer
The Try keyword is used to allow you catch errors when they occur. If you didn't catch them, they would cause the program to end with an error report.
' Code goes in here that might throw an error
Catch Ex As Exception
' Code goes here to deal with any error
The Me keyword refers to the current instance of the class in which the word appears. For example if the class is called Form1, then Me allows you to refer to the current instance of the class when the code is running.
Private Sub is formed from two Keywords. Private is an "Access modifier". When applied to a Sub it means that the Sub would not be visible outside the class. Sub is short for "Subroutine". A subroutine is a section of code that performs some useful function that you might want to run many times. For example you might want to do something whenever a button is clicked, and so you would write a subroutine with code in that will run whenever the button is clicked.
It would be better to ask programming questions in a visual basic forum. There are many on the internet. Search the internet for "visual basic forum". Also note that when you are using Visual Studio 2005, you can press the F1 key when you have placed the cursor in a word that you do not understand, and it will open the help and the relevant page.
These terms are very very difficult to understand when you have never programmed before. Usually it is best to take a lot of it on faith, and move on through the book or example that you are following without completely understanding it all. Over time, with practice, repetition and perseverance you will start to develop an understanding of the underlying concepts. They are hard to explain and hard to learn.
create form1 with one list box and form2 with text boxes and command button.
Go to project >project properties>start object will be form2..
Here i takenexamble of two textboxes..code is below
Private Sub Command1_Click() Form1.List1.AddItem Text1.Text, 0 Form1.List1.AddItem Text2.Text, 1 Form1.Show End Sub
It is very simple all you need is. Imports Microsoft.Win32 Public Class Form1 Dim reg As RegistryKey = Registry.LocalMachine.CreateSubKey("Software\MyApp\", RegistryKeyPermissionCheck.ReadWriteSubTree) Dim regKey As RegistryKey = Registry.LocalMachine.OpenSubKey("Software\MyApp\", True)
Private Sub SetBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SetBtn.Click regKey.SetValue("KeyName", "Path") End Sub
Private Sub GetBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GetBtn.Click Dim Path As String Path = regKey.GetValue("KeyName") End Sub End Class
dim rs as new adobc.recordset dim cn as new adobc.connection
private sub xn() cn.cursorlocation = aduseclient cn.open "CONNECTION STRING" <------ end sub
private sub form_load() call xn if rs.state=adstateopen then rs.close rs.open "select * from TABLENAME" ,cn, adlockstatic, adlockreadonly if rs.recordcount > 0 then set datagrid1.datasource = rs end sub
What the heck are you compiling it with that doesn't give a line number for that error? Pay attention to the titles of messageboxes! Perhaps noting what lines you changed from the original will give a clue to narrow it down, but I expect you addressed an object with a property (object.property) in a context that can't be expected to generate or use that property as you gave it. Moreover there are spaces in object names, it seems....