i have a sortedLIst. The value in sortedList is already change to percentage.
when i key in the minimum support, if the value is not fulfill the minimum support, then it will be ignore.
MY sortedList:
1: 55
2: 70
4: 25
3: 65
6: 15
5: 30
my expected output when i key in minimum support =40%
1: 55
2: 70
3: 65

my code are shown below:

double v2;
            richTextBox13.Clear();
            foreach (String sorting2 in sortList1.Keys)
            {
                if (!(sortList11.ContainsKey(sorting2)))
                {
                    sortList1.TryGetValue(sorting2, out v2);

                    sortList11.Add(sorting2, v2);
                    double Count1 = (double)sortList11[sorting2];
                    sortList11[sorting2] = (v2 / ContentBox.Lines.Length) * 100;

                }
                richTextBox13.AppendText(string.Format("{0:n2}", sorting2 + ": " + sortList11[sorting2].ToString()) + "\n");
            }

            double[] store = new double[richTextBox13.Lines.Length];
            int al = 0;
            foreach (double abv in sortList11.Values)
            {
                store[al] = abv;
                al++;
            }
            string min_supp = textBox9.Text;
            double min = Double.Parse(min_supp);
            textBox4.Text = textBox9.Text;
            string output = "";

            for (int prune = 0; prune < richTextBox13.Lines.Length; prune++)
            {
                if (store[prune] >= min)
                {
                    output += store[prune] + "\n";
                }
                richTextBox14.Clear();
                richTextBox14.AppendText(output);
            }

now my problem is when i key in minimum support 40%, then it fill filter, but just can show the value only, cant show the key.

hope someone can help me..

i have a sortedLIst.

No you don't. Stop using the name sortedlist and use meaningful variable names. And if you don't show the declaration of the variable tell us what it really is.

Define:
sortList1
sortList11
etc.