C#

public string Int64ToHex(System.Int64 number)
{
    return String.Format("{0:X}", number);
}
 
public double HexToInt64(string hexString)
{
    Int64 actint=0;
    if(hexString!=null && !hexString.Equals(string.Empty))
    {
	try
	{
            actint=System.Int64.Parse(hexString, System.Globalization.NumberStyles.HexNumber, CultureInfo.CurrentCulture);
	}
        catch
	{
	}
    }
    return actint;
}

foreach(Control c in this.Controls)
{
    TextBox actTextbox = c as TextBox;
    if(actTextbox!=null)
    {
         //Here it is.
    }
}

private void FindAllTextBoxes(Control c)
{
    if(c!=null)
    {
        if(c.Controls!=null)
        {
            foreach(Control actControl in c.Controls)
            {
                TextBox actTextBox = actControl as TextBox;
                if(actTextBox!=null)
                {
                    //Here it is.
                }
                else
                {
                    FindAllTextBoxes(actControl);
                }
            }
        }
    }
}

J4amieC wrote:

but your example shows tyhe main ingredients

Martin# wrote:

If he is only searching for one special TextBox instance which is somehow marked (over the Tag property for example), then there is no need for holding all the references, I guess.

for(int i=0;i < this.Controls.Count; i++)
{ 
    if(this.Controls[i].GetType() == typeof(System.Windows.Forms.TextBox))
    {
      MessageBox.Show("textbox");
    }
}

this.Controls[i].GetType() == typeof(System.Windows.Forms.TextBox)