C#

private void Form1_Load(object sender, System.EventArgs e)<br />
{<br />
	OpenFileDialog dlg = new OpenFileDialog();<br />
	dlg.Filter="Image files (*.BMP, *.JPG, *.GIF)|*.bmp;*.jpg;*.gif";<br />
	if(dlg.ShowDialog()==DialogResult.OK)<br />
	{<br />
		Image colourImage = Image.FromFile(dlg.FileName);<br />
		Image greyscaleImage = GreyscaleImage(colourImage);<br />
<br />
		//Do stuff with the images here<br />
<br />
		//Clean up<br />
		colourImage.Dispose();<br />
		greyscaleImage.Dispose();<br />
	}<br />
}<br />
<br />
private Image GreyscaleImage(Image img)<br />
{<br />
	Bitmap bm = new Bitmap(img.Width, img.Height);<br />
	Graphics g = Graphics.FromImage(bm);<br />
<br />
	ColorMatrix cm = new ColorMatrix(new float[][]{ new float[]{0.5f,0.5f,0.5f,0,0},<br />
														new float[]{0.5f,0.5f,0.5f,0,0},<br />
														new float[]{0.5f,0.5f,0.5f,0,0},<br />
														new float[]{0,0,0,1,0,0},<br />
														new float[]{0,0,0,0,1,0},<br />
														new float[]{0,0,0,0,0,1}});<br />
<br />
	ImageAttributes ia = new ImageAttributes();<br />
	ia.SetColorMatrix(cm);<br />
	g.DrawImage(img,new Rectangle(0,0,img.Width,img.Height),0,0,img.Width,img.Height,GraphicsUnit.Pixel,ia);<br />
	g.Dispose();<br />
<br />
	return (Image)bm;<br />
}

Schimaera wrote:

I have a string 'str = textBox12'

Schimaera wrote:

int a = ConvertToInt16(str.Text);

1. Iterate through the form's Controls collection to get at the named control.
   
2. Use Int16.TryParse() to convert the .Text property of that control to an integer.

string lookForControl = "textBox12";
string foundControlText = "";
foreach(Control ctrl in this.Controls)
{
  if(ctrl.Name == lookForControl)
  {
     foundControlText = ctrl.Text;
  }
}
MessageBox.Show("Control " + lookForControl + " has the Text: " + foundControlText);

FieldInfo fi = this.GetType().GetField( "textBoxInfinity", BindingFlags.Instance | BindingFlags.NonPublic );
TextBox txt = fi.GetValue( this ) as TextBox;
txt.Text = "HELLO";

Schimaera wrote:

I didn´t heared about reflections. (is this right -> grammar?)

J4amieC wrote:

Had the poster come back and said "It does not work because textbox12 is inside a panel", then I would have delved into the obvious recursive method!