Find Numbers Gaps

March 10, 2014 at 1:52 AMadmin


Numbers Gaps is a small utility that is going to give you the missing numbers in a series .

Usage :  if you are working with a serial numbers in your application and you want to know if one of the numbers in the middle is deleted it can cause a pain to your mind if you try to do it manually .

but if you have a tool that make this for you , it will be very good.

The Code :

create as GUI like the bellow screen shoot





Then add the following code to the ( Find Gaps) Button

int[] myData = StringToInts(txtsource.Text);


int mMin = myData.Min();

int mMax = myData.Max();


StringBuilder myStr = new StringBuilder();

int mCount = 0;

for (int ii = mMin; ii <= mMax; ii++)


    if (myData.Contains<int>(ii) == false)


        myStr.Append(ii.ToString() + Environment.NewLine);





txtResult.Text = myStr.ToString();

lblCount.Text = "Total Numbers Found : " + mCount.ToString();




and add the following method to the same class


private int[] StringToInts(string myString)


    List<int> ints = new List<int>();

    string[] strings;


    if (myString.Contains(","))

strings = myString.Split(',');


strings = myString.Split(Environment.NewLine.ToCharArray());



    foreach (string s in strings)


int i;

if (int.TryParse(s.Trim(), out i))





    return ints.ToArray();




Posted in: .NET | IT