Develop Reference

Update button for GridView

I'm trying to create an Update button to let me insert data into a gridview and after creating the class, the button does nothing and I don't understand why that is the case.
private void Basic()
{
// no updates allowed
dataGridView1.AllowUserToAddRows = false;
dataGridView1.AllowUserToDeleteRows = false;
dataGridView1.ReadOnly = true;
//UpdateButton is available
UpdateButton.Enabled = true;
//Save and Cancel Unavailable
SaveButton.Visible = false;
CancelButton.Visible = false;
sTableAdapter.Fill(dataSet1.S);
}
This is the UpdateButton Event
private void UpdateButton_Click(Object sender, EventArgs e)
{
dataGridView1.AllowUserToAddRows = true;
dataGridView1.AllowUserToDeleteRows = true;
dataGridView1.ReadOnly = false;
UpdateButton.Enabled = false;
SaveButton.Visible = true;
CancelButton.Visible = true;
}
And this should be the update class:
this.UpdateButton.Location = new System.Drawing.Point(12, 63);
this.UpdateButton.Name = "UpdateButton";
this.UpdateButton.Size = new System.Drawing.Size(103, 23);
this.UpdateButton.TabIndex = 0;
this.UpdateButton.Text = "Update";
this.UpdateButton.UseVisualStyleBackColor = true;
The connection is made with a accdb.
The Update button isn't working on click, what did I do wrong?

Enable and Disable buttons, labels based on some conditions

I have 5 buttons and 5 labels next to each button. When i run the app i expect the first button to be enabled and the the rest disabled and greyed out with the labels. after i click the first button it should disable with the label and enable the second button, and so forth with all the other buttons.
this way is to long, is there a better way of doing this?
private void Form1_Load(object sender, EventArgs e)
{
btn1.Enabled = true;
btn2.Enabled = false;
btn3.Enabled = false;
btn4.Enabled = false;
btn5.Enabled = false;
lblStep1.Enabled = true;
lblStep2.Enabled = false;
lblStep3.Enabled = false;
lblStep4.Enabled = false;
lblStep5.Enabled = false;
}
private void btn1_Click(object sender, EventArgs e)
{
btn1.Enabled = false;
btn2.Enabled = true;
btn3.Enabled = false;
btn4.Enabled = false;
btn5.Enabled = false;
lblStep1.Enabled = false;
lblStep2.Enabled = true;
lblStep3.Enabled = false;
lblStep4.Enabled = false;
lblStep5.Enabled = false;
}
private void btn2_Click(object sender, EventArgs e)
{
btn1.Enabled = false;
btn2.Enabled = false;
btn3.Enabled = true;
btn4.Enabled = false;
btn5.Enabled = false;
lblStep1.Enabled = false;
lblStep2.Enabled = false;
lblStep3.Enabled = true;
lblStep4.Enabled = false;
lblStep5.Enabled = false;
}
}
private void btn3_Click(object sender, EventArgs e)
{
btn1.Enabled = false;
btn2.Enabled = false;
btn3.Enabled = false;
btn4.Enabled = true;
btn5.Enabled = false;
lblStep1.Enabled = false;
lblStep2.Enabled = false;
lblStep3.Enabled = false;
lblStep4.Enabled = true;
lblStep5.Enabled = false;
}
private void btn4_Click(object sender, EventArgs e)
{
btn1.Enabled = false;
btn2.Enabled = false;
btn3.Enabled = false;
btn4.Enabled = false;
btn5.Enabled = true;
lblStep1.Enabled = false;
lblStep2.Enabled = false;
lblStep3.Enabled = false;
lblStep4.Enabled = false;
lblStep5.Enabled = true;
}
private void btn5_Click(object sender, EventArgs e)
{
btn1.Enabled = true;
btn2.Enabled = false;
btn3.Enabled = false;
btn4.Enabled = false;
btn5.Enabled = false;
lblStep1.Enabled = true;
lblStep2.Enabled = false;
lblStep3.Enabled = false;
lblStep4.Enabled = false;
lblStep5.Enabled = false;
}

Let all these buttons and labels are inside a container(if it doesn't mean that you can use this.Controls as well if the form contains these buttons and labels only). Let it be pnlContainer, Now you can try something like this:
public void ButtonController(Button buttonToEnable, Label labelToenable)
{
foreach (Control ctrl in panel1.Controls)
{
if (ctrl == buttonToEnable || ctrl == labelToenable)
{
ctrl.Enabled = true;
}
else
{
ctrl.Enabled = false;
}
}
}
So in Form1_Load you want to enable btn1 and lblStep1 so the call should be :
ButtonController(btn1,lblStep1);
For btn1_Click the method call will be like ButtonController(btn2,lblStep2);. in short, you can pass the button and label that you want to enable to this method, which will disable rest of controls in the container.

How can I set delay between code lines in C#?

I am new to c# and I am using windows forms.
I have form1 with 3 buttons. I am trying to set the 3 buttons so they appear one by one when/after the form loads . I used the following code but it did not work when I run the program the 3 buttons appear in the same time
private void MainForm_Load(object sender, EventArgs e)
{ //Hide all buttons
button1.Visible = false;
button2.Visible = false;
button3.Visible = false;
Thread.Sleep(500);
//show buttons one by one
button1.Visible = true;
Thread.Sleep(500);
button2.Visible = true;
Thread.Sleep(500);
button3.Visible = true;
}
I do not know what I am doing wrong. Can anyone help me how can I make the 3 buttons appear one by one when/after the form loads. I am happy to receive any other ideas . Thank you

You are blocking the UI thread with Thread.Sleep, and the updates aren't being reflected.
The best you can do is to create an async function and use Task.Delay, in this way the thread will be still responsive and you will see the updates:
private async void MainForm_Load(object sender, EventArgs e)
{ //Hide all buttons
button1.Visible = false;
button2.Visible = false;
button3.Visible = false;
await Task.Delay(500);
//show buttons one by one
button1.Visible = true;
await Task.Delay(500);
button2.Visible = true;
await Task.Delay(500);
button3.Visible = true;
}

The main issue here is that Load is called before the form is rendered. This, combined with the fact that Thread.Sleep blocks the current (UI) thread causes the buttons to all be made visible before the form actually renders.
You can solve this by using the Form.Shown event and making your pauses asynchronous.
private async void Shown(Object sender, EventArgs e) {
var buttons = new[] {button1, button2, button3};
foreach (var button in buttons)
{
await Task.Delay(TimeSpan.FromMilliseconds(500));
button.Visible = true;
}
}
Make sure that your buttons still get initiated with Visible = false;

Set the Visible of all buttons to False in Form_Load event as you do.
Create a timer with the desired interval and some counter.
Inside the Timer.Tick event, set visibility of your buttons one by one, depending on the counter value, like this:
switch(counter)
{
case 0: button1.Visible = true; break;
case 1: button2.Visible = true; break;
case 2: button3.Visible = true; break;
}
counter++;
Then when all your buttons are visible, disable the timer.

button1.Visible = false;
button2.Visible = false;
Task.Factory.StartNew(() =>
{
Thread.Sleep(2000);
this.Invoke((MethodInvoker)delegate { button1.Visible = true; });
Thread.Sleep(2000);
this.Invoke((MethodInvoker)delegate { button2.Visible = true; });
});

How To Make A Child Execute Command Button in C#

i having a little advance with Command Button
lets say i having a form with
label1
label2
label3
And one command button of course
before click the command button
label1.Visible = true;
label2.Visible = false;
label3.Visible = false;
if i click the command button
label1.Visible = false;
label2.Visible = true;
label3.Visible = false;
and then i click again
label1.Visible = false;
label2.Visible = false;
label3.Visible = true;
and repeated again, then back to first before i click the command button
i didnt have any reference on this, so i just make a duplicated command button with same position in form, and i use the visible to get the another command button to be clicked
but it looks not cool,
is there any way better than i make?

you can make one button, and count the number of clicks the user has done, depending on the mod operation you can invoke any of the three method you provide, something like this:
int count = 1; //count clicks
private void ButtonClick(object sender, EventArgs e)
{
if(count%2 == 0)
{
label1.Visible = false;
label2.Visible = true;
label3.Visible = false;
}
else if(count%3 == 0){
label1.Visible = false;
label2.Visible = false;
label3.Visible = true;
}
else{
label1.Visible = true;
label2.Visible = false;
label3.Visible = false;
}
count++;
}

Something similar to this will allow you to only have one command button.
public int visibleLabel = 1;
private void commandButton_Click(object sender, EventArgs e)
{
this.visibleLabel += 1;
if (this.visibleLabel == 4) this.visibleLabel = 1
label1.visble = false;
label2.visble = false;
label3.visble = false;
switch (this.visibleLabel)
{
case 1:
label1.visble = true;
break;
case 2:
label2.visble = true;
break;
case 3:
label3.visble = true;
break;
}
}
Alternatively, you might want to consider having a single label and changing the text (assuming they are in the same locations as well)

Why dont you use a flag to track the current status of the command button? If I understand your question right you want a single command button that sets label2 to visible at first click and label3 visible at second click and label1 visible on third click. Do something like this in the command button click handler:
switch (status)
{
case 0:
{
label1.Visible = false;
label2.Visible = true;
label3.Visible = false;
status = 1;
break;
}
case 1:
{
label1.Visible = false;
label2.Visible = false;
label3.Visible = true;
status = 2;
break;
}
case 2:
{
label1.Visible = true;
label2.Visible = false;
label3.Visible = false;
status = 0;
break;
}
}
Some of the code is redundant, and of course you should have a integer variable called status somewhere in your class. Anyway, this should be fairly understandable and I hope it helps.

how to change form icon in windows forms

please i need a help i'm writing a code for hangman game and i want just to change the icon of the form , i try that using the icon property but it doesn't work any more ,please how i can do this ,and also i do the following project-->properties--->icon and manifest but also it doesn't work this is my code for the game it work perfectly :
private void button1_Click(object sender, EventArgs e)
{
stage_count++;//strat from stage 1
if (!int.TryParse(textBox1.Text.ToString(), out value))
return;//if user inter non_integer value do no thing and wait for new entry
if (key ==value )//directly if user guesses the key he/she wins the game
{
//view the seventh picture in hangman game
button1.Enabled = false;
textBox1.Text = "";
textBox1.Enabled = false;
pictureBox7.Visible = true;
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
groupBox1.Visible = true;
label1.Text = "Great... You Got It ^_^ ";
}
if (key > value)//guide the user to the correct answer
label1.Text = "Should Be Greater than" + value.ToString();
if (key < value)//guide the user to the correct answer
label1.Text = "Should Be Less than" + value.ToString();
if (key != value)
{
switch (stage_count)
{//this switch statement used to do some thing in each stage
case 1:
//view the first picture in hangman game
pictureBox1.Visible = true;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
break;
case 2:
//view the second picture in hangman game
pictureBox1.Visible = false;
pictureBox2.Visible = true;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
break;
case 3:
//view the third picture in hangman game
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = true;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
break;
case 4:
//view the fourth picture in hangman game
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = true;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
break;
case 5:
//view the fifth picture in hangman game
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = true;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
break;
default:
//view the sixth picture in hangman game
//it's the last try so diable the button and show the result
button1.Enabled = false;
textBox1.Text = "";
textBox1.Enabled = false;
groupBox1.Visible = true;
label1.Text = "YOU LOSE ,, IT WAS : " + key.ToString();
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = true;
pictureBox7.Visible = false;
break;
}//end switch
//to make empty focused textbox
textBox1.Text = "";
textBox1.Focus();
}//end if
}
private void groupBox1_Enter(object sender, EventArgs e)
{
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{// if user want to playe new game the programm must enables the important controls and
//make the visible property equals to false for all the pictures boxes
if (radioButton1.Checked == true)
{
stage_count = 0;
key = (1 + obj.Next(99));
textBox1.Enabled = true;
textBox1.Text = "";
textBox1.Focus();
button1.Enabled = true;
label1.Text = "Guess a number btween 1-100";
pictureBox1.Visible = false;
pictureBox2.Visible = false;
pictureBox3.Visible = false;
pictureBox4.Visible = false;
pictureBox5.Visible = false;
pictureBox6.Visible = false;
pictureBox7.Visible = false;
groupBox1.Visible = false;
radioButton1.Checked = false;
}
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
// if user won't to play again just close it
if (radioButton2.Checked == true)
{
radioButton2.Checked = false;
this.Close();
}
}
}
}

GO Properties window and change "Icon" property with your own icon.

You need to perform following steps
Add you icon to resouce file of project
than Asssing the created resource to you icon property .
Icon = Resources.adobe_reader_icon;

You have to set it in the properties of your project.
If you start your application by pressing F5 in VisualStudio and the icon doesn't appear, take a look in the Debug-(Release) Directory. There should be the correct icon

The icon of a form is only displayed if:
- ControlBox is true
- FormBorderStyle is not None
- Text is not empty
If so, you should then be able to set it with this.Icon = ...
Also the icon should be available as project resource. For this, you can just edit the forms Icon property, and in the following dialog import the icon from a .ico file.

<pre>
application root directory
application resources directory **LIKE** ../../resources/dropbox.ico
this.Icon = new System.Drawing.Icon("../../dropbox.ico");
</pre>

First Solution then Properties of the project Add .ico file
Then open Form which you want icon
In Form property you can find Icon Field
There you can change Icon your windows form.