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I'm sorry for the confusion. There are 2 files to a UserControl when created from the application:
In this case
UserControl1.cs
UserControl1.Designer.cs
The latter file contains the standard Dispose() code which I did not supply since it's just standard code.
For arguments sake, I started with the code you referenced 'as is'.. That means I copied and pasted the whole sample into a project file, built it, and tried it by loading it into a from from the toolbox; it did not function as described...
1. When the mouse moves into the control, the control does not show the highlight the border as the MouseEnter() method should do.
2. The property that is added in the designer "OutlineColor" does not show in the grid properties.
I've managed to get the debugger to work in DesignMode and set a break points in the MouseEnter() method and the OutLineColor.Set property and the OnPaintAdornments() method. None of the break points are hit when the control is loaded into the form.
thanks
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can anybody guide me
how to save Image or Bitmap to svg file
thanks
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You can't: one uses pixels (bitmap); the other uses vector graphics (xml).
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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is Image a file format for saving textures? I might have heard of the "img" as file format but I`m not absolutely confident.
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I Knew if I asked the question I would get it to work. I tried a different nuget package,
specifically System.Data.SQLite and now it works. Sorry for the bogus post.
I've just upgraded to VS2022 from VS2005 so I am sort of lost. I've tried several methods from
suggestions on the internet and still have not been able to add a reference to sqlite in my
test project. When I try to manually add the sqlite3.dll I get a message saying the dll is immutable.
Articles on the internet seem to suggest you can use it but I can't find a way to add a reference.
Can someony help?
Thanks
-- modified 28-Jul-22 20:11pm.
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mo1492 wrote: I Knew if I asked the question I would get it to work.
That's the way if goes, sometimes - it's known as Rubber Duck Debugging[^] 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Hi,
How do I set the voice in Text to Speech in C#?
I have a toolStripMenu that I load the voices into. Then when one is chosen, I want it to use that voice. Haven't been able to figure set the voice to the chosen name.
Thanks.
private void Get_Voices()
{
ISpeechObjectTokens voices = objSpeech.GetVoices("", "");
foreach (ISpeechObjectToken v in voices)
{
ts_Menu = new ToolStripMenuItem();
v_name = v.GetDescription(0);
ts_Menu.Text = v_name;
ts_Menu.CheckOnClick = true;
voicesToolStripMenu.DropDownItems.Add(ts_Menu);
ts_Menu.Click += voice_Menu_Click;
}
}
private void voice_Menu_Click(object sender, EventArgs e)
{
ToolStripMenuItem item = sender as ToolStripMenuItem;
foreach (ToolStripMenuItem tempItemp in voicesToolStripMenu.DropDownItems)
{
if (tempItemp == item)
{
tempItemp.Checked = true;
}
else
{
tempItemp.Checked = false;
}
}
choosen_voice = sender.ToString();
}
private void Speak(string txt)
{
SpVoice objSpeech = new SpVoice();
objSpeech.Speak(txt, SpeechVoiceSpeakFlags.SVSFlagsAsync);
objSpeech.WaitUntilDone(Timeout.Infinite);
}
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You're welcome - but please try the official documentation first next time! 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I use C# in Visual studio 2022 (in portuguese) and I have a form solution where I open an Excel file and introduce data. In one cell I have to put a formula: "=IF(H5=0;D5;H5)". When I do this I receive an error: System.Runtime.InteropServices.COMException: 'Exceção de HRESULT: 0x800A03EC'. For simple formulae, like "=B4*C4", it works fine. The error is the same wheter the formula is in portruguese or english. Does anyone know what is hapening? Thanks.
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Googling the error code returns several hits suggesting that switching from .xls to the more recent (and more functional) .xlsx format can fix the problem. As always: An error code may have different underlaying causes. Maybe this doesn't help with yours. Make sure to use the .xlsx format anyway, to be sure that that is not the cause of your problems.
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You should be using comas; not semi-colons.
IF function
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Gerry. You are right. In my language we use semicolons. When I substituted the semicolons with commas, it worked! Thank you!
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using System;
using System.Collections.Generic;
using System.Linq;
namespace ValidParenthese {
public class Solution {
public bool IsValid(string s) {
var result = s.ToCharArray().ToList();
bool value = true;
for (int i = 0; i < result.Count; i++) {
if (result[i].ToString().Equals("(")) {
if (result[i + 1].ToString().Equals(")")) {
value = true;
} else {
var count = result.Count;
if (count >= 3) {
var index = result[i + 1];
if (result[i + 2].ToString().Equals(")")) {
value = false;
} else if ((index.ToString().Equals("{") && result[i + 2].ToString().Equals("}"))
|| (index.ToString().Equals("[") && result[i + 2].ToString().Equals("]"))) {
if (result[i + 3].ToString().Equals(")")) {
value = true;
} else {
var ind = result[i + 2];
if ((ind.ToString().Equals("{") && result[i + 3].ToString().Equals("}"))
|| (ind.ToString().Equals("[") && result[i + 3].ToString().Equals("]"))) {
if ((index.ToString().Equals("{") && result[i + 4].ToString().Equals("}"))
|| (index.ToString().Equals("[") && result[i + 4].ToString().Equals("]"))) {
if (result[i + 5].ToString().Equals(")")) {
value = true;
} else {
value = false;
}
} else {
value = false;
}
} else {
value = false;
}
}
}
} else {
value = false;
}
}
} else if (result[i].ToString().Equals("{")) {
if (result[i + 1].ToString().Equals("}")) {
value = true;
} else {
var count = result.Count;
if (count >= 3) {
var index = result[i + 1];
if (result[i + 2].ToString().Equals("}")) {
value = false;
} else if ((index.ToString().Equals("(") && result[i + 2].ToString().Equals(")"))
|| (index.ToString().Equals("[") && result[i + 2].ToString().Equals("]"))) {
if (result[i + 3].ToString().Equals("}")) {
value = true;
} else {
var ind = result[i + 2];
if ((ind.ToString().Equals("(") && result[i + 3].ToString().Equals(")"))
|| (ind.ToString().Equals("[") && result[i + 3].ToString().Equals("]"))) {
if ((index.ToString().Equals("(") && result[i + 4].ToString().Equals(")"))
|| (index.ToString().Equals("[") && result[i + 4].ToString().Equals("]"))) {
if (result[i + 5].ToString().Equals("}")) {
value = true;
} else {
value = false;
}
} else {
value = false;
}
} else {
value = false;
}
}
}
} else {
value = false;
}
}
} else if (result[i].ToString().Equals("[")) {
if (result[i + 1].ToString().Equals("]")) {
value = true;
} else {
var count = result.Count;
if (count >= 3) {
var index = result[i + 1];
if (result[i + 2].ToString().Equals("]")) {
value = false;
} else if ((index.ToString().Equals("(") && result[i + 2].ToString().Equals(")"))
|| (index.ToString().Equals("{") && result[i + 2].ToString().Equals("}"))) {
if (result[i + 3].ToString().Equals("]")) {
value = true;
} else {
var ind = result[i + 2];
if ((ind.ToString().Equals("(") && result[i + 3].ToString().Equals(")"))
|| (ind.ToString().Equals("{") && result[i + 3].ToString().Equals("}"))) {
if ((index.ToString().Equals("(") && result[i + 4].ToString().Equals(")"))
|| (index.ToString().Equals("{") && result[i + 4].ToString().Equals("}"))) {
if (result[i + 5].ToString().Equals("]")) {
value = true;
} else {
value = false;
}
} else {
value = false;
}
} else {
value = false;
}
}
}
} else {
value = false;
}
}
} else {
}
}
return value;
}
}
class ValidParentheses {
public static void Main(string[] args) {
var solution = new Solution();
if (solution.IsValid(Console.ReadLine())) {
Console.WriteLine("valid");
} else {
Console.WriteLine("invalid");
}
}
}
}
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See my answer to your original question on this subject.
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Hint: If you have to call .ToString more than twice in a single method, your design is showing signs of being flawed to the point of being unsalvageable and needs to be scrapped and your approach to the problem redesigned from scratch.
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using System;
using System.Collections.Generic;
namespace CalPoints {
class Solution {
public int CalPoints(string[] ops) {
var opsList = new List<string>();
var value = 0;
foreach (var item in ops) {
if (item.Equals("+")) {
var index = int.Parse(opsList[opsList.Count - 1]) + int.Parse(opsList[opsList.Count - 2]);
opsList.Add(index.ToString());
value = 0;
foreach (var val in opsList) {
value += int.Parse(val);
}
} else if (item.Equals("D")) {
var index = int.Parse(opsList[opsList.Count - 1]) * 2;
opsList.Add(index.ToString());
value = 0;
foreach (var val in opsList) {
value += int.Parse(val);
}
} else if (item.Equals("C")) {
opsList.RemoveAt(opsList.Count - 1);
value = 0;
foreach (var val in opsList) {
value += int.Parse(val);
}
} else {
opsList.Add(item);
foreach (var val in opsList) {
value += int.Parse(val);
}
}
}
return value;
}
}
class CalPoints {
public static void Main(string[] args) {
var solution = new Solution();
var space = new char[] { ' ' };
string[] ops = Console.ReadLine().Split(space);
int output = solution.CalPoints(ops);
Console.Write(output.ToString());
}
}
}
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The error means that you are trying to use a variable reference that does not point to a valid object. For example in the following line:
string[] ops = Console.ReadLine().Split(space);
If the call to Split does not return any strings, then ops is a null reference. You need to use the debugger to find out exactly where the exception is thrown.
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To add to what Richard has said ...
This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.
Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterday's shirt when you took it off last night.
We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!
Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, it will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, the debugger will stop before the error, and let you examine what is going on by stepping through the code looking at your values.
But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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That happens when you declare an object (you mention just the type and object name) and leave it there, and later try to use it. You need to also use the new keyword followed by the object type before you can use the object (sometype somename = new sometype() that sort of thing, I don`t remember the exact C# syntax)
modified 28-Jul-22 7:53am.
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I use the following code to read pdf file into memory stream:
private void PdfReport(string address)
{
PdfSource = new FileStream(address, FileMode.Open);
}
When I tried to open some files one after another, I noticed that the memory occupation increases gradually. How can I manage memory in this case?
modified 26-Jul-22 12:40pm.
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It may mean that you are creating streams faster than the GC can clean up any freed objects. But without more information that is very much a guess.
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I use Syncfusion PDF for loading pdf files in my WPF application. I use MVVM architecture in my project. I have the following property:
private int _selectedId;
public int SelectedId
{
get { return _selectedId; }
set
{
SetProperty(ref _selectedId, value);
if (value != null)
{
PdfSource = null;
string fileName = GetFileName(SelectedId);
if (fileName != null)
{
PdfReport(string.Format("{0}/{1}", "src/pdfs/", fileName));
}
}
}
}
private Stream _pdfSource;
public Stream PdfSource
{
get { return _pdfSource; }
set { SetProperty(ref _pdfSource, value); }
}
When I read file stream into this property, it can load the pdf and show it.
I don't know why there is a memory leak.
Is there any solution to this problem?
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