first sentence letter capital in c#
public static class StringExtension
{
public static string CapitalizeFirst(this string s)
{
bool IsNewSentense = true;
var result = new StringBuilder(s.Length);
for (int i = 0; i < s.Length; i++)
{
if (IsNewSentense && char.IsLetter(s[i]))
{
result.Append (char.ToUpper (s[i]));
IsNewSentense = false;
}
else
result.Append (s[i]);
if (s[i] == '!' || s[i] == '?' || s[i] == '.')
{
IsNewSentense = true;
}
}
return result.ToString();
}
}