C# Program to convert first character uppercase in a sentence

Let us say the following is your string −

String str = "Welcome to our website!";

Create a char array of the string included above using the ToCharArray() method:

char []ch = str.ToCharArray();

To convert the first character to uppercase −

if (ch[i] >= 'a' &amp;&amp; ch[i] <= 'z') {
   // Convert into Upper-case
   ch[i] = (char)(ch[i] - 'a' + 'A');
}

Example

You can try to run the following code to convert first character uppercase in a sentence.

using System;
class Demo {
   static String MyApplication(String str) {
      char []val = str.ToCharArray();
      for (int i = 0; i < str.Length; i++) {
         if (i == 0 &amp;&amp; val[i] != ' ' ||
            val[i] != ' ' &amp;&amp; val[i - 1] == ' ') {
               if (val[i] >= 'a' &amp;&amp; val[i] <= 'z') {
                  val[i] = (char)(val[i] - 'a' + 'A');
               }
            } else if (val[i] >= 'A' &amp;&amp; val[i] <= 'Z')
               val[i] = (char)(val[i] + 'a' - 'A');
      }
      String s = new String(val);
      return s;
   }
   public static void Main() {
      String str = "Welcome to our website!";
      Console.Write(MyApplication(str));
   }
}

Output

Welcome To Our Website!