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how to draw fixed string on pictureBox using C#?

I have to draw some text on pictureBox image (Gray scale image). I got some codes. its working but its moving with the image while panning and zooming, and it disappear while changing the window level.
rect = pictureBox1.ClientRectangle;
Graphics g = Graphics.FromImage(bmp);
SolidBrush brush = new SolidBrush(Color.Green);
Font f = new Font("Arial", 15);
g.DrawString("Murugesan", f, brush, start);
I want the text in the permanent location and it never disappear while changing the window level. Anybody there to help me.

You should draw it on PictureBox OnPaint event and use e.Graphics.
Probably you wouldn't have artifacts you mentioned if you used:
Graphics g = pictureBox.CreateGraphics();
But paint on event is still better than that.

c# webbrowser Form Drawing Rectangle

My question may sound stupid but I wonder if I can draw a rectangle over my webbrowser object and move that constant sized rectangle over my webbrowser?
I have tried to draw a rectangle but rectangle does not visible on my form and webbrowser.
I dont know what is wrong with it.
Graphics g = webBrowser1.CreateGraphics();
Rectangle rect = new Rectangle(400,400, 200, 100);
using (Pen pen = new Pen (Color.Red, 2)
{
g.DrawRectangle(pen, rect);
}
this is the code..I just tried to draw a rectangle first than to deal with mouse thing but I was not successful at drawing.
However, I have noticed that the rectangle is actually existing but it is under the WebBrowser object. I need my rectangle to be on top of the WebBrowser.
How can I bring the Rectangle on to the top of my WebBrowser so it can be visible?

Change
Graphics g = webBrowser1.CreateGraphics();
with
Graphics g = Form1.CreateGraphics();
Assuming Form1 is the name of your form.

How to keep the image Drawn in PictureBox

Hey everyone, a new guy here in C#.Net.
I'm trying to make an application like Ms Paint, of course much simpler, and I'm stuck.
The problem is this.
In pictureBox, I'm drawing grid lines on the PictureBox, after that I'm reading a .map(A Mapper3 file) and want to draw onto grid lines, but When I draw the map, The grid lines disappers.
I think the problem is because of the PictureBox Image becomes null while I'm drawing the map. How can I overcome this, is there any tricks?
Thanks for the replies from now on, and sorry for my bad English...
My best Regards...

Do you using winforms? If yes, you actually dont need picture box for working area. I think more appropriate would be Graphics class on form or panel. You have lost lines because of form repaint circle, put your drawing code into form paint handler and picture would be repainted when it needed. In some cases you can need to manual trigger repaint circle, for this purposes you should use Invalidate method of your form.
For example, add this code to paint handler:
private void Form1_Paint(object sender, PaintEventArgs e)
{
// Drawing vertical lines
for (int x = 5; x < this.ClientRectangle.Width; x+=5)
{
e.Graphics.DrawLine(Pens.Gray, new Point(x, 0), new Point(x, this.ClientRectangle.Height));
}
// Drawing horisontal lines
for (int y = 5; y < this.ClientRectangle.Width; y += 5)
{
e.Graphics.DrawLine(Pens.Gray, new Point(0, y), new Point(this.ClientRectangle.Width,y));
}
}
You also may use Graphics in button click handler this way:
Graphics g = Graphics.FromHwnd(this.Handle);
g.FillEllipse(Brushes.Beige, new Rectangle(10, 10, 10, 10));
But in this case all you have drawn would be erased during form's repaint circle and you will have to repeint it in form paint handler
[EDIT]
Ok, for example you have pictureBox1 on your form, you can easly draw into it with help of Bitmap class in this way:
// Draw into bitmap
Bitmap bmp = new Bitmap(150, 150);
Graphics g = Graphics.FromImage(bmp);
g.FillRectangle(Brushes.Green, new Rectangle(25, 75, 10, 30));
// Set bitmap into picture box
pictureBox1.Image = bmp;
In this case you have no need to redraw your paintings, picture box would do it for you. Dont forget to set BackColor ot picture box to Transparent if you prefer to show paintings from below of picture box.

You have to draw everything including the grid lines whenever the paint event raised, if you are concerned about performance you may detect the clipping area and only draw that portion.
Good luck.

How to delete a drawn circle in c# windows form?

I have drawn a circle in windows form
Pen pen = new Pen(Color.Black, 3);
Graphics gr = this.CreateGraphics();
gr.DrawEllipse(pen, 5,5,20,20);
How to delete it...

You have to clear your Graphic:
Graphics.Clear();
But all drawn figures will be cleared. Simply, you will then need to redraw all figures except that circle.
Also, you can use the Invalidate method:
Control.Invalidate()
It indicates a region to be redrawn inside your Graphics. But if you have intersecting figures you will have to redraw the figures you want visible inside the region except the circle.
This can become messy, you may want to check out how to design a control graph or use any graph layout library.

You can invalidate the draw region you want to refresh for example:
this.Invalidate();
on the form...

Assuming you're subscribing to the Paint event or overriding the protected OnPaint routine, then you will need to perform something like this:
bool paint = false;
protected override void OnPaint(object sender, PaintEventArgs e)
{
if (paint)
{
// Draw circle.
}
}
Then when you want to stop painting a circle:
paint = false;
this.Invalidate(); // Forces a redraw

You can make a figure of same dimensions using the backColor of your control in which you are drawing
use after your code to clear your figure.
Pen p = new Pen(this.BackColor);
gr.DrawEllipse(p, 5,5,20,20);

In fact, you can delete your circle and nothing but your circle.
Everything you need is something like a screenshot of the "before state" of the area you want to clear, to make a TextureBrush from it. You can achieve that step by something like this:
Bitmap _Background = new Bitmap(this.Width, this.Height);
Graphics.FromImage(_Background).CopyFromScreen(this.Left, this.Top, 0, 0, this.Size);
The first line will give you a bitmap in your windows forms size. The second line will save a screenshot of it in the _Background-bitmap.
Now you create a TextureBrush out of it:
Brush brsBackground = new TextureBrush(_Background);
The next thing you need are the dimensions of your circle, so you should save them into a variable, if they are not a fix value. When you got them at hand, you can clear the specific area like this:
Graphics gr = this.CreateGraphics();
gr.FillEllipse(brsBackground, 5, 5, 20, 20); // values referred to your example
Done!
Even complex figures are able to be deleted by this, like a GraphicsPath for example:
GraphicsPath gp = new GraphicsPath(); // any kind of GraphicsPath
gr.FillRegion(brsBackground, new Region(gp));

You don't "delete" it per se, there's nothing to delete. It's a drawing, you draw something else over it or you can call the Graphics.Clear() method.

If u are using Invalidate() and is not working, make a panel.Refresh().
That will work on you.

just make another control with the attributes etc. that you want, make the visibility to false and set the region of the control to the other control like this:
pen.Region = pen2.Region;

It is very simple to delete a drawn circle from c.
There is only four steps:-
Open turbo app
go to the command where you had drawn the circle
drag the command
click on delete button

Highlight selected custom control with C# WinForms

I have created a custom control (the control is used for drag and drop) and I want to add focus and selected events to the control. Both need to be visually distinct. So I plan to implement a windows style for both of these events. For focus I have the control drawing a solid and a dotted line around the control using the following code in the Paint event.
if (Image != null)
{
if (ContainsFocus)
{
// Draw a dotted line inside the client rectangle
Rectangle insideRectangle = ClientRectangle;
insideRectangle.Inflate(-2, -2);
insideRectangle.Width--;
insideRectangle.Height--;
Pen p = new Pen(Color.Black, 1);
p.DashStyle = DashStyle.Dot;
g.DrawRectangle(p, insideRectangle);
// Draw a solid line on the edge of the client rectangle
Rectangle outsideRectangle = ClientRectangle;
outsideRectangle.Width--;
outsideRectangle.Height--;
p.DashStyle = DashStyle.Solid;
g.DrawRectangle(p, outsideRectangle);
Color transparentLightBlue = Color.FromArgb(100, Color.LightBlue);
Brush solidBrush = new SolidBrush(transparentLightBlue);
g.FillRectangle(solidBrush, ClientRectangle);
}
}
For the Focus event I want just the image to be highlighted (similar to windows explorer). My first attempt at this was to add the following code.
Color transparentLightBlue = Color.FromArgb(100, Color.LightBlue);
Brush solidBrush = new SolidBrush(transparentLightBlue);
g.FillRectangle(solidBrush, ClientRectangle);
This works filling in the rectangle however I would like to just highlight the image itself instead of the entire rectangle. I've had the idea of using two different images, however the image is supplied to me and I'm not storing them.
So my question: How is the best way to get just the image of the control that has focus to highlight?
Thank you in advance!

since your image is not transparent you could overlay it with a transparent highlight color. something similar to this.