I have noticed that when iterating DataGridViewColumns, the speed is greatly reduced if the columns are visible.
For Each col As DataGridViewColumn In cData.DataGridView.Columns
col.Visible = visible
Next
If visible is set to false (and all columns are all currently visible), iterating 264 columns takes around 0.35s, however, if visible is set to true (and all columns are currently invisible), the same process takes around 30s.Does anyone know what would be causing the extra time?Could it something internal to the DataGridView Control?
How do i exactly check internet connection speed.I have searched around google and found out a method w/c will Download a file like 1mb size, then it will calculate the speed.
I have a codes that calculates DownLoad speed and UpLoad speed kb/s. I would like to implement this kind. I also want to put such kind of graph. Any article or links where can I start building my own like that.
I created a custom datagridview column for a progressbar and included customizable color properties but I can't get them to work right. After compiling, the properties show up correctly in the Edit Columns popup editor, but changing the values has no effectThe designer generated code shows the original values and manually changing them there has the desired effect(I know you're not supposed to, just testing). Here is the code for the column even though I don't think the issue is stemming from any coding errors there.
I created a custom datagridview. In the constructor of that datagridview, I set
Me.AutoGenerateColumns = False
and then, declared and added 4 DatagridViewImageColumns and 140
DatagridViewTextBoxColumns by the code ... Dim dvgCol as New DataGridViewImageColumn
[code]....
But when I add an instance of that datagridview onto a form, in the form.design.vb there are many code defines for each columns and then sometimes adds additional code to create those columns again. Sometime when I delete the datagridview control in the form,that code is not deleted.
I am building an application that contains several DataGridViews that may have 100-20,000 rows displayed with a DataTable as its DataSource.When the user wants to filter a column they right-click the DataGridView Column Header and a ContextMenuStrip shows a small DataGridView that displays all the unique values in that column. I currently get all the unique values using a loop which is slow (shown below).[code]...
I have a datagridview that I am dynamically building columns for, adding them to the datagridview, and then attaching a dataset. The dataset has more than one table. What sort of syntax should I use to specify the datatable column that the DataGridViewColumn needs to look for in the dataset
I am working with a datagridview. Is there any chance a column is set to be a textbox initially but for example I want the top item to be a combobox??? This should enabled the user to select something of the list but also load in what was selected and saved before... So for example I have a column called Product Name and it has 5 rows 4 of them should appear as textboxes but one top cell should appear as combobox
following code from c# to visual basic, and I'm coming up with the following error: 'Public Event ItemCheck(sender As Object, e As System.Windows.Forms.ItemCheckEventArgs)' as an event, and cannot be called directly. Use a 'RaiseEvent' statement to raise an event.
i am developing a program in visual basic 2010, it involves a non- linear iteration of one of the two variables with a step of .00 and a match at the .000 (3rd) decimal placethere cannot be an exact match between the 2 variable's values but i need the iteration to stop at the nearest possible value.
Background: I am working on an ASP.net project that basically fills out a form from user input. The generated form (for reasons which I have no control over) must be a JPEG or TIFF. So the user fills out the web form, which takes all of the input values and meges them into a blank image (jpeg) of the form. Using System.Drawing, it merges all of the text onto the form at designated Points. The points are defined as variables which are modified at runtime to compensate for the resolution of the image (in case it get modified/re-generated at a different dpi). All of this is working fine.
Problem: Currently I have a Sub that determines the dpi of the master image, then adjusts the Points accordingly. However, there are ~50 variables that have to be adjusted. So currently I have the Sub go thru each point variable and manually adjust the X & Y values. I have been working on a Sub that will iterate thru all of the Point variables and do adjustment. Here's a functional sample of what I have working:Imports System.Drawing
Partial Class test Inherits System.Web.UI.Page
[Code]...
This works...sort of. It allows me to grab each variable and modify it, but only in the instance. The original variable in the class is unchanged. Which means that when the program gets to the point where it's drawing text to the image, the points are unmodified. my basic question is: Is it possible to modify the original variable using this sort of process? If not, is the best way to use these modified values to declare the new class instance at a global level, then have the Sub that draws the text use the instance versions of the variables?
I realize that I could define all of the points in an array which would be easy to loop thru and update, but I've named each point variable something meaningful to correspond to the related text to be drawn.
I'm flummoxed I'm using VB.Net, Linq, and a DataContext. My DataContext contains a table 'transactions'.
I first declare an IQueryable(Of transaction) and assign it to nothing. I build a predicate in a foreach loop and use a transactions.Where(predicate) to assign the IQueryable a value. If I do an IQueryable.ToList(), I get a number of items in the collection.
However, on the next iteration of the loop, the IQueryable.ToList() gives me 0 items.This is driving me crazy. I tried to use the LINQ to SQL Debug Visualizer with VS2010, (I recompiled the 2008 version with the new reference) but no dice - I can't see the SQl generated or what's inside the IQueryable.
I have List (of class). having 1800 of count and each object has 90 properties. When I terate earch with 90 properties taking more and more time. How to resolve this
Dim cellIntStyle As HSSFCellStyle = hssfworkbook.CreateCellStyle cellIntStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#") Dim cellDateStyle As HSSFCellStyle = hssfworkbook.CreateCellStyle
Does anybody know how to count the number of iterations in a for-each loop? I want to have a variable inside the loop, returning the corresponding counter every time the loop iterat
I want to create a (3n*7) Matrix in python through Iteration, I did this in VB.Net and it worked but it gives me some challenge in Python as this a new language to me. n can be the number of Iterations to build up the matrix, i.e. ; if u iterated 3 times, the matrix will be a 9*7 matrix. Here is how I did it in VB.Net. :
i have a for loop that is executing. i want while the loop is executing to be able to define using a variable how many seconds the For loop needs to pause before next iteration.
I'm designing an app that resets permissions on folders so I've made a treeview that uses GetDirectories to populate itself with all folders on a user's computer. The TreeView has the "checkboxes" property set to true so the idea is that users select all of the folders from this treeview that they want to reset permissions on and then click go.
So once they click go I need to loop through all nodes in the treeview and all subnodes etc and test to see if they are checked, then if they are I want to add each node to a list and then in the next routine I would loop through the list and reset the permissions.This is what I am doing at the moment but I keep finding that the objects added to my list are duplicated.For example if I select C:Test and C:TestTest2 in my treeview then I end up with my List looking like this:
I'm trying to create a structure wherin I have got 1 mother thread and 2 child threads. The child threads get variables to work with from their mother thread and after completion they report back to the mother with the resulting variables. I'd like to be as efficient as possible so creating a new thread every time a thread has finished it's work is kind of a no-go. How can I create this structure without creating a new thread for every iteration?
