want to convert hex in to binary

use the PadLeft function of the string to pad zeroes to the left

Ref:http://msdn.microsoft.com/en-us/library/system.string.padleft.aspx[^]

private string hex2binary(string hexvalue)
{
  string binaryval = "";
  binaryval = Convert.ToString(Convert.ToInt32(hexvalue, 16), 2);
  binaryval = binaryval.PadLeft(8,'0');
  return binaryval;
}

The String.PadLeft method creates a new string that is right-aligned so that its last character is a specified number of spaces from the first index of the string. White spaces are inserted if you do not use an override that allows you to specify your own custom padding character.

For example you would use it like this:

protected string hex2binary(string hexvalue, int  iPaddingLength)
{
    string binaryval = "";
    binaryval = Convert.ToString(Convert.ToInt32(hexvalue, 16), 2);
    binaryval = binaryval.PadLeft(iPaddingLength, '0');
    return binaryval;
}

Hi,


You need to use Number Format Method to specify your string number pattern.
look at the example on this link :




Number Formatting[^]


Regards

string binaryval = "";
string bi = "";
binaryval = Convert.ToString(Convert.ToInt32(textBox1.Text, 16), 2);
if (binaryval.Length < 8)
{
for (int i = binaryval.Length; i < 8; i++)
{
bi = '0' + binaryval;
binaryval = bi;
}
textBox2.Text = bi;
}

You may simply add the required 0s:

private string hex2binary(string hexvalue)
{
  string binaryval = "";
  binaryval = Convert.ToString(Convert.ToInt32(hexvalue, 16), 2);
  binaryval = binaryval.PadLeft(8, '0');
  return binaryval.Insert(4, " ");	
}