Display Misspelled words between two strings in asp.net

In my application, I have two strings and I need to display missing words that count, Inserting words that count and modified words that count between them. For example:

 

string variable2="are wrting server code yu cannn never be sure Demo what 
the address you is to.In fact Demo1 some users like it this way";  

The result should be:

   Missing Words: see ,IP 
   Missing Words count: 2 

   Inserted: Demo, Demo1
   Inserted Words count: 2

   Modified words : wrting,yu ,cannn ,refering  
   Modified words count :4

 //Missing Word Count
 var result = variable1.Split(new char[] { ' ' }).Except(variable2.Split(new char[] { ' ' })).ToArray();
 count = result.Length;
 Label2.Text += "Missing Word Count: " + count.ToString() + "

";
 for (int i = 0; i < count; i++)
 { 
Label1.Text += "Missing Word: " + result[i].ToString() + "

"; 
}

 //Insert Word 
var result1 = variable2.Split(new char[] { ' ' }).Except(variable1.Split(new char[] { ' ' })).ToArray(); 
count = 0; 
count = result1.Length;
for (int i = 0; i < count; i++)
 { 
Label3.Text += "Insert Word: " + result1[i].ToString() + "

";
 }
 Label4.Text += "Insert Word Count: " + count.ToString() + "

";

 //Modifide Words 
string[] tempArr1 = variable1.Split(' ');
string[] tempArr2 = variable2.Split(' '); 
int counter = 0;
for (int i = 0; i < tempArr1.Length; i++)
{
if (tempArr1[i] != tempArr2[i])
{
lblwords.text=tempArr1[i] + ", "+ tempArr2[i];
 counter++; 
} 
} 

My requirement is need to display missing  words,inserted words and modified words 
between two large  strings(documents). i am getting missing and inserted words
but i didn't get modified words.i am trying this but i am not getting
can anyone please help me it's very  urgent requirement.

Thank you