Clear The Contents Of A Listbox And All Other Feilds
Mar 10, 2009
how I can clear the contents of a listbox and all other feilds.this is what I have upto now, and this clears texbox, checkboxes ect... but it wont clear contents that appears in a listbox:
I'd just like to know how to clear a listbox of its entire contents. I know in VB6 it was something along the line of 'lstBox.Clear', but that doesn't seem to be the case in this new version of VB.
I have a form with a datagridview on it. I have a save button that saves the data from the datagridview to the database.After the button (save) is clicked I want the datagridview to be cleared of the data that is present in the dataGirdView.
I am doing a school project and have created a small program that allows the user to create a binary search tree and then visually displays it on the screen as a familiar tree structure, how the addition, deletion of nodes in the tree works along with many other things such as different tree traversals. I currently using a large panel on the main form and then adding user controls containing a textbox that displays imputed values,then using the panels paint event I draw a line between the user controls, this works fine however for deletion of a node I need to clear the main panel of the nodes that will change and add them to the panel again or just clear the hole panel and redraw the whole tree
I need to delete/clear all data from an existing csv file from Visual Basic. This seems really simple but I have had a lot of problems making it happen!
I have this: Dim split As String() = temp_string.Split(",") ''#feed all info into global variables patient_id = split(0) doc_name = split(1) lot__no = split(2) patient_name = split(3) How do I clear all the contents of split() ?
I am using the following code for a checkbox, if checked it should print the text defined, unchceked, it clears the items in the ricktextbox. My problem is it prints fine (lets say it prints two lines) as defined, when I uncheck, it clears the text in rich text box, but when I check again, the text appears in the richtext box, but displayed from 4th line. I need to restart from the beginning/ or at least from the next available line. I cant use clear() since it erase all the contents as i have another 3 checkbox items placed.
If CheckBox1.Checked Then richtextbox.SelectionColor() = Color.Blue richtextbox.AppendText("Urgent:") richtextbox.AppendText(CheckBox1.Text.ToString + vbNewLine) Else richtextbox.Refresh() End If
What I have is on my form there are several text boxes. These text boxes are for user input and attached to each text box is a Private Sub txtBox1_KeyPress function. In that function I have some validation code to check that the user is inputing only what I want them to. And if it doesnt it will pop up a message box telling them so, then it is supposed to clear the text box so the user can try again. But no matter what I try, the text box does not clear it still keeps the last character typed (the invalid one).
Here is the code for one of the text boxes.
Private Sub txtLanIp_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtLanIp.KeyPress Dim strEmpty As String = "" If Char.IsDigit(e.KeyChar) = True Or Char.IsPunctuation(e.KeyChar) = True Or Char.IsControl(e.KeyChar) = True Then 'do nothing
[code]....
The commented methods at the bottom are some of the other things ive tried to make this work. The txtLanIp.text.clear() is what ive tried from the beginning. I have also tried setting the text to "", I even created an empty string and set the .Text value to it but no matter what it wont remove that character. I have also tried various trim(), len(), Select() functions, most either give me an 'index out of range error', a 'length cannot be less than zero' error or a general ExceptionOutOfBounds error. I am just tearing my hair out as to why the simple way doesnt work, there is no logical reason why and it gives no error it just doesn't clear the box.
I have also tried moving the validation to a _LostFocus but e.KeyChar isnt a valid method or property for that declaration, which doesn't surprise me but I wanted to try everything.I dont see how it would matter in this case but I am running Windows XP Pro SP3, though I also see the same behavior in Windows 7 64 bit ultimate sp1 and windows 7 64 bit pro.
I'm writing a code in which the user is supposed to enter a number less than or equal to 15 and greater than 0.And If user enters a number greater than 15 then he gets an error msg. I do have the right code for error messge but the listbox still shows the result along with the error message box. How do I JUST have the error message.[code]
I enter a name into a text box as well as a score (from 0-100) into a separate text-box then i press 'Add to array' and they go into the array BUT THE DON'T SHOW UP until i press "Show me the array.Once i press "show me the array" i get my names and scores in 2 separate parallel arrays (which is what i want)but now i need to assign a grade to each student (preferably next to each students score and name.I have no idea how to do this, possibly use Case-where or a series of 'If' statements?[code]...
I have a list box which gets populated on the first run of the program by the user. On the next run it needs to be completely cleared so new values can be displayed.
how do you filter/search a numeric number from your form feilds in vb.net. i have filtered a feild with textbox containing names(first name) but this time i would like to search/find what is containing in a numeric textfiled which is phone number textfield.A phone number is numeric and it might contain both characters and numbers. for example, one can write +44 7961400000. In textfield for fname, i have the following:
I am unable to do that and am getting anomalies when I use the SelectedIndexChanged event twice. It's all repeating.
Private Sub cboSearchCustomer_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboSearchCustomer.SelectedIndexChanged Dim strFmt As String = "{0,13}{1,13}{2,13}{3,10}{4,13}"
I have a small script that logs all of the website I visit and then displays them on a form. When I open the form the first time it displays all of the websites like it should. However, the second time I open it, it displays two of every website. The third time opening it, three of every website. I think that it is because the data doesn't get erased from the listbox when I close the form. Is there a way to clear the listbox when the form closes or do I need to find a new way to set it up?
The user enters information into a textbox, and if it is present in the litsbox an error message will be displayed, if it is not already in the listbox then it will be added to it.
I save what the user enters as a variable and i am wondering if its possible to check the exact contents of a listbox?
So, I have a little GUI setup with a Listbox and a Richtextbox.I want the Listbox to display all of the .txt files displayed within a folder I have defined, then when a ListBox item is selexted, it displays the contents of that file within the RTB
Been trying to figure out how to do this for a while, but I can't seem to find anything that exactly covers what I'm trying to do. I'm really a novice when it comes to vb .net, so this might be staring me in the face and I wouldn't know it.I've got a Motorola MC3090 mobile barcode scanner running Windows CE 5.0 at work. I wrote a small program (in .net 3.5) that allows me to scan barcodes and then get counts for specific barcodes when I type all or part of the barcode into an textbox. That works pretty well for receiving, but I need something that works better for the reverse process (shipping things out).
I have an textbox which accepts the barcodes. When the scanner emulates an enter key press, it adds the code to a listbox and clears the input field. This process loops as many times as my quantity field specifies. There's another textbox which I use to input partial barcodes that I want counts for. It looks for strings in the listbox that match, dumps them into a second hidden listbox, and counts those.
If you're the tl;dr type, here's the short of what I want to do with all of the above. I want to take the contents of the visible listbox, summarize by listing each unique barcode, and have a count of how many of each unique barcode appears in the listbox.