hi i have a string = "Hello<br>My<br>Friend<br>". how can i get the number of "<br>" from this string in asp.net?

here ya go.

string brString = "Hello<br>My<br>Friend<br>"

// Count holds the number of <br>s found
int count = 0;

// Loops until it can't find any instance of <br> in the string
while(true)
{
        // finds the location of the first <br> in the string
      int i = brString.IndexOf("<br>");
      if(i < 0)
      {
            break;
      }

        // Gets rid of the string up to and including the <br>
      brString = brString.Substring(i+4);
      count++;
}

So now count represents the number of <br>s found.  If you don't want to lose the string, just put the value into a temporary string.

Let's try that again:

Const BR As String = "<br>"
Dim MyString As String = "Hello<br>My<br>Friend<br>"
Dim NumberOfBRs As Integer = (MyString.Length - MyString.Replace(BR, String.Empty).Length) / BR.Length

ignore my comment acperkins is correct.
acperkins :
i am sorry i calculated it wrong:(