You can use
public bool IsAlpha(string strToCheck)
  {
    Regex objAlphaPattern=new Regex("[^a-zA-Z]");
    return !objAlphaPattern.IsMatch(strToCheck);
  }
Regards
solved Validate input string [closed]
 
You can use
public bool IsAlpha(string strToCheck)
  {
    Regex objAlphaPattern=new Regex("[^a-zA-Z]");
    return !objAlphaPattern.IsMatch(strToCheck);
  }
Regards
solved Validate input string [closed]