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Disable Parent Control of a button in windows Forms

so what i want to do is, on Event ButtonClick disable parent Control of this button.
In my Form i have several Panel's in which those button actually are.
I am using following code:
private void button1_Click(object sender, EventArgs e)
{
Control control = button1.Parent;
control.Enabled = false;
}
This xode is working fine, but I wanted to use this.Parent instead of button1.Parent, so that each button would be able to disable its own parent Panel(in this case will disabled Panel of button1).
When i am using this.Parent I get a System.NullReferenceException.
Knows some one why i am getting this error ?

this is your current class you want to use the sender and cast it to Control than get it's parent something like this
private void button1_Click(object sender, EventArgs e)
{
var uc = sender as Control;
uc.Parent.Enabled = false;
}

this represents the Window, which has no Parent.
You can do the following:
private void button_Click(object sender, EventArgs e){
Control control = ((Button) sender).Parent;
control.Enabled = false;
}
Button[] buttons = {button, button2....};
foreach (Button button in buttons)
button.Click += button_Click;
Alternatively, you can create a class inheriting from Button. You can then add a Click event handler that disables it's parent control. You can then use this button instead of the default one.

How to access 2 User Controls at a time?(1 from another)

I have made 2 user controls. First one contains a textbox and a button. In the second one there is a panel and a repeater control is used. Now when I am writing in the textbox 2nd control will open as a popup and and after focusing to textbox I am unable to write. I have searched a lot about this but nothing works.
CustomPopup customPopup;
Popup popup;
popup = new Popup(customPopup = new CustomPopup());
private void txtSearch_TextChanged(object sender, EventArgs e)
{
popup.Width = Width;
popup.Show(this);
popup.AutoClose = false;
}
In this way I am opening the popup from the textbox text changed event.

You can use this textbox event.
private void textBox1_Enter(object sender, EventArgs e)
{
}
this event call whenever textbox get focus

Getting access to Button parent

I'm using a Button in a class. When the button is pressed, it should call a routine with the button's corresponding text. How do I convert the sender into a String_Entry? Also, I'm quite a newbie regarding object oriented/class programming, so comments are welcome.
public class String_Entry
{
public TextBox textbox;
public Button send;
// other stuff
public String_Entry()
{
textbox = new TextBox();
send = new Button();
send.Click += new System.EventHandler(this.bSend_Click);
// put in GUI, set parameters and other stuff
}
// other stuff
private void bSend_Click(object sender, EventArgs e)
{
// Trying to get the corresponding String_Entry from the Button click event
Button cntrl = (Button)sender;
String_Entry entry = (String_Entry)(cntrl.Parent);
parse.ProcessHexLine(entry);
}
}

Your solution of encapsulating a button with a textbox and the event handler is sound. It just goes wrong in the event handler:
private void bSend_Click(object sender, EventArgs e)
{
Button cntrl = (Button)sender;
String_Entry entry = (String_Entry)(cntrl.Parent);
parse.ProcessHexLine(entry);
}
Firstly, there is no point to doing anything with sender as it'll be the same as the field send. Next cntrl.Parent will give you a reference to the Form, or other container object, that contains the button, not this instance of String_Entry. To access that, use this. So you can change the event handler to:
private void bSend_Click(object sender, EventArgs e)
{
parse.ProcessHexLine(this);
}

writing one method only for all button's MouseEnter event

I want to show Image on MouseEnter event of button control(I have 6 buttons) ,I can use below code for each button
void button1_MouseEnter(object sender, EventArgs e)
{
this.button1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img2));
}
but I Don't want to write it for each buttons enter event ,and hence trying to make it only on method so can use for each button something like this ,but how do I will select different image for different button via this method than ?
void button_MouseLeave(object sender, EventArgs e)
{
var btn = (Button)sender;
this.btn.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.particular image for particular button));
}

You register the same event for all buttons.
For example:
btn1.MouseEnter += genericButton_event;
btn2.MouseEnter += genericButton_event;
You add the image to resources for example using the same name as the button so you can use the btn.Name property. (Something like: btn1.png and btn2.png), and you assign the resource using reflection with the string property "name":
private void genericButton_event(object sender, EventArgs e)
{
var btn = (Button)sender;
btn.BackgroundImage = new Bitmap(System.Reflection.Assembly.GetEntryAssembly().
GetManifestResourceStream("MyProject.Resources" + btn.Name +".png"));
}
You get the bitmap from resources using strings, so you can get the desired background image depending on button name.

You could use the Tag attribute for that. It takes an object - so you can put there whatever you want.
Or you could chose which image to display by naming them after the button and searching for the correctly named image.
Button btn = new Button();
btn.Tag = <YourImage>; // Here you define which image to show
btn.MouseLeave += btn_MouseLeave;
void btn_MouseLeave(object sender, EventArgs e)
{
Button b = (Button)sender;
b.BackGroundImage = (System.Drawing.Image)b.Tag;
}
Of course you'd have to check if the Tag is null.

handling multiple button actions in one action in C#

I have 70 buttons whose names are like button1, button2, button3 and so on.
My aim is that whenever button1 is clicked, it will say "1", button2 will say as "2" and so on for the others.
The code for button1 to speak is:
SpeechSynthesizer synthesizer = new SpeechSynthesizer();
private void button1_Click(object sender, EventArgs e)
{
synthesizer.Speak("1");
}
For button2
private void button2_Click(object sender, EventArgs e)
{
synthesizer.Speak("2");
}
and so on for other 68 buttons.
Now it is difficult to implement the 70 button's actions. These button actions follow a pattern - so can anyone suggest a more efficient way I can implement these button handlers to save me writing out 70 different actions?

Try something like this
button1.Tag = "1";
button2.Tag = "2";
...
private void button_Click(object sender, EventArgs e)
{
synthesizer.Speak(((Button)sender).Tag.ToString());
}

Use same handler for all buttons. Sender of event will be the button which raised event. You can get it's name and extract text to say:
private void button_Click(object sender, EventArgs e)
{
Button button = (Button)sender;
string text = button.Name.Substring("button".Length);
synthesizer.Speak(text);
}

Create a single handler for all of the buttons.
Cast the sender parameter to get the Button instance that was clicked, and figure out what to do based on its Name, Text, or Tag.
Depending on your UI, you might want to generate all of those buttons in a loop, too.

You can subscribe them to a single eventhandler.
thus:
button1.Click += buttonClicked;
button2.Click += buttonClicked;
// and so on
and the code for the buttonClicked;
private void buttonClicked(object sender, EventArgs e)
{
//This will get the Type first, the name and then the last character on the Name
synthesizer.Speak(sender.GetType().Name.Substring(sender.GetType().Name.Length - 1, 1));
}
this promotes code reuse for you :)