How could I make the datagridView to unload data from database. I mean, once you make datagridview, it will load data from database so I would like to make it to not load any data. This is for searching purposes where you want to display datagridview look like empty and when user enter information to search in, it then has to display data.
Something like Students.datagridView.
VB 6.0
Private Sub Form_Unload(Cancel As Integer)
VB.NET 2008
VB 6.0
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
VB.NET 2008
is VB.Net supported this two events ?
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.Close() End Sub
after the program was executed, warning is come out like this "object Disposed Exception was unhandled"
I'm trying to add a MsgBox and a few other things when a user exists the program but I can't seem to find the event for the form.
I tried the "leave" form event but it's not working.
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I have many forms in my project. When the project starts to run, the form named as˜frmMawill be loaded. I had given links to load other forms from this form. When other form gets loaded I want to close this main form. To do so I used the following
View 3 Repliesi need help to delete a record in a database table in crystal report, after the report had been view from the new page and when the page is close. the report is done in vs2008 c#.
View 2 RepliesI have an application in which i need to load a specific keyboard layout only when application is running and a text box (Textbox1) is under focus. I don't have an idea to load a specific keyboarded in VB.NET via programming.
View 1 Repliesis there a way to make this less in code?Usually when im going to populate a datagridview with data I usually do in this way
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That how I make things harder although there's a function "DataGridView1.DataSource = myDataTable" and put an sql where selecting those data. I just want to use some other method. so how am I able to add some columns row dynamically and if another column of the database need to get how am I able to add it in that loop is there other way and I want the less code nor the shorter code that you can give to me. I just want to learn and make my code more shorter
I have a program for school project that has input fields for Name, Address, City, State and Zip. I need to error check so that the fields are not empty.I have used If statements that check to see if the fields are empty and shows a message box if they are but if I leave the whole form empty and click the button that activates it, all the if statements go- one by one instead of pausing for the user to input the required data.How do I check for data and make the program stay there until the data is input? I have tried TRY/CATCH but it won't catch this type of error.
this is the
'This program computes customer's bills at the pizza shop for all combinations of
'crusts, toppings, sizes and discounts
Option Strict On
Public Class PizzaForm
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i'm got this sql query code in dataset designer
SELECT pkt.fldPackageID, pkt.fldPSID, pkt.fldQuantity, pkt.fldQuantityUsed, pkt.fldRetail, pkt.fldPK, ps.fldName
FROM tblPaketRow AS pkt INNER JOIN
tblProdukDanService AS ps ON ps.fldID = pkt.fldPSID
WHERE (pkt.fldPSID = @param)
I'm trying to display the results in datagridview,i drag from the data source in vs 2008..I can't figure out to do that.I use this code to set the @param on form_load event.
Me.TblPaketRowTableAdapter.JoinTable(SalonDataSet.tblPaketRow, modCommon.s)
I am using Visual Basic express to create a serial interface to a multi-room audio controller. I have started by creating a form that can connect to the controller and I can receive data from the Controller and display Zone status, volume etc in corresponding texts box thaks to help from Stanav and Tassa in my previous thread.
My next problem is to do with receiving lots of data from the serial port and my application getting out of sync. This is mainly caused by turning the volum control as each time it is turned a little bit the controller sends out the new status of the Zone being effected
eg
****Turning Volume knob on Zone 1***
Status returned from Controller:
#Z01PWRON,SRC3,VOL05<CR>
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Is there a way to "unload" a file from the Adobe PDF control so that it is blank, like it is before you load any file? I tried Me.AxAcroPDF1.LoadFile(Nothing) but that doesn't work.
View 2 RepliesI have a class that inherits from DataGridView. However, when I create a new instance, set the position, width and height and then run the project, the datagridview is not rendered.Is there something else I need to do the make the datagridview become visible?
View 2 RepliesI am using following codes to format datagridview column headers,that works fine.My question is: how to make all headings bold? (bold header row)[code]
View 1 RepliesI have a datagridview checkbox column bound to an integer field. When I click the checkbox a value of 1 is saved to my database. But when I unclick it a blank is saved to the database. How can I make a 0 get saved when it is unclicked?
View 2 RepliesHow to make datagridview current row bold & green color?
View 1 RepliesHow to save data in datagridview using vb2008.
View 1 RepliesTable gpass has data as
gate-----date-----c----bno----acccode----tittle----weight-------qty
1----18/01/2010---a----2--------2----------abc-----10.00-------15
Then there are two textbox having values as
txtgat.text=1
txtdat.text=18/01/2010
I these codes and it generates error message as ArgumentOutOfRangeException was unhandled.Idex was out of range. Must be non-negative and less than the size of collection. Parameter name: Index
Private Sub txtGat_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtGat.TextChanged
If Len(Me.txtGat.Text) > 0 AndAlso Me.txtDat.Text IsNot Nothing Then
str = "Select * from gpass where vou_no= " & Val(Me.txtGat.Text) & " And Date = '" & Me.txtDat.Text & "'"
dt = GetTable(str)
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In my winform, i m using a datagridview.. I m also allowing to enter data through it. User has to select a product and put in price for it. for products column i have used combo box and for rate column i have used text box.I want that once user has selected a product, he is not allowed to select the same product for other rows... I mean duplicate product selection not allowed... how do I prevent it..
View 11 RepliesI have 4 DatagridView's. I want to take the data from 1,2,3.. and then place it on 4. (I am adding some images). The Names in 1,2,3.. Should correspond with that is 4. SO ,,that means i want to accumulate the totals of each player and place it in the final DataGridView.
View 1 RepliesI have a little big problem in one application.
I have a datagridview with data from a datatable, this datatable have these fields (id,num1,num2, date,user,ref,qt,cost,center), some of them are hided in the dgv (id,num1,num2,date,user). The user can edit,delete and add new rows to the dgv.
I have a save button that performs this actions:
First check if there are new rows, and if yes it fill the hidden fields. Then validate the inserted values by the user with a couple of ifs. In the end, i call the bindingsource EndEdit, and call the adapter Update command against the datatable...
This sometimes works others not really, i don't understand why.
The error it's: "Concurrency violation: the DeleteCommand affected 0 of the expected 1 records"
I think sometimes when Updating it occurs to.
Here is my problem: I have a DataGridView and I am adding a new row. In a particular cell, I have to check that the user does not enter existing values in the related table. That is, the value of that cell must be unique. If the user enters an existing value, the application must:
- Show error message
- Clean the cell
- Put the focus again into the cell, to allow the user to enter another value.
Would you know someone do this?
I am working on a vb6 to vb.net migration project using vs 3.5. I have a datagridview.in a particular cell of this grid, user has to enter only numeric data. but after user enter data, itshould become concainated with a $ symbol (eg: if user enter 34, the cell value should become $34). And if he/she presses the hyphen ("-") in the key board, the data (ie. $34) should become -$34 and if again presses the hyphen button in key board, the data should become $34.
View 3 RepliesHow can i use the ProductID to compare and call out the corresponding Product Name and Selling Price column from the MsAccess Database and display in the second DGV?
View 6 Repliesi am developing a windows application using vb.net and sql server. I have a windows form in which there is datagridview that calculates the 3 rates for a product E.g Pogo Lunch Box its cost price is 10 Rs. now we need to calculate 3 types of rate
rate 1 is 5% added to cost price = 10.50
rate 2 is 7% added to cost price= 10.70
rate 3 is 10% added to cost price.= 11
everything is fine till now, I am very able to do this... Now my problem sometimes the user may change the rates whatever he wants as eg. in this case rate1 maybe 10.80
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i wrote a program that i can search within a fixed database that contains names,phone number... ok,what i need is that i want to be able to print these results or to print the whole database i used printform1.print() for sure it printed the whole intervace of the program
View 2 RepliesSQL database and it populates a few Listbox's i have, What i want to do now is filter out a lot of the data.Basically, out of all the data rows i have, i want to be able to filter everyone except ID# 123 or 456.
View 1 RepliesI have this test form where I'm testing the idea, but ran into a snag. Now the main idea is to load all the data from a dataset into the one column of the datagridview. This works perfectly as shown in the image. Now there is something that I want to happen, but just can't get it right. when on the DataGridViewComboBox Column I also want to be able to type in my own data if the one I want is not available in the combobox.
Also if there are 50 values in my combobox and 2 of them are:
jacky, jacson
When I type jac, I want the combobox to only give me the options starting with "jac"
Here is the code that I'm currently using:
Dim dt As DataTable
Dim dsNewDataset As New DataSet()
Dim i = 0, intSetArray As Integer = 0
Public Function JT_PullDataWithCOLUMNS1(ByVal Cols As String, ByVal TableName As String) As DataTable
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I can't seem to add data in my DatagridView by having set the Columns, this what my datagridView looks like:he combobox you see where filled by this
ReaderQuery("Select ChargType from ChargeType")
cmbCharge.Items.Clear()
While dr.Read
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1) How can i load data from Text file to DatagridView.I Want it because i'm making a lister. And when i load a data from text file, i want to edit rows. And this calling the second question.
2) How can i save data, Datagrid to Text file.
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