how to store text file lines to arry using C#

Question

 showing error

 

 

 

 

using (StreamReader r = new StreamReader(filename)

{

string s = string.Empty;

int i = 0;

while ((i = r.Read()) != -1)

{

Char c = Convert.ToChar(i);

if (Char.IsDigit(c) || Char.IsLetter(c))

{

s = s + c;

}

else

{

if (s.Trim() != string.Empty)

Console.WriteLine(s);

s = string.Empty;

}

}