Permutation for Web application

[Vedavathi B]

I have Created a webapplication which displays the combination of inputs supplied.

                        Permutation<string> permutations = new Permutation<string>(inputSet);
                        foreach (IList<string> p in permutations)
                        {
                            dr = dt.NewRow();
                            dr1 = dt.NewRow();
 
                            if (!string.IsNullOrEmpty(txtFirst.Text) || !string.IsNullOrEmpty(txtSecond.Text))
                            {
                                dr["Shuffle"] = String.Format("{0} {1}   ", p[0], p[1]);
 
                                dr["Shuffle"] = dr["Shuffle"] + ", " + txtFirst.Text + " " + txtSecond.Text;
 
                                dt.Rows.Add(dr);
                            }
                            else
                            {
                                dr["Shuffle"] = String.Format("{0} {1}  ", p[0], p[1]);
 
                                dt.Rows.Add(dr);
                            }
                        }
 
 
 
 
                        /////// THREE COMBINATION
 
                        Permutation<string> permutations2 = new Permutation<string>(inputSet);
                        foreach (IList<string> p in permutations2)
                        {
                            dr = dt.NewRow();
                            dr2 = dt.NewRow();
 
                            if (!string.IsNullOrEmpty(txtFirst.Text) || !string.IsNullOrEmpty(txtSecond.Text))
                            {
                                dr2["Shuffle"] = String.Format("{0} {1} {2}  ", p[0], p[1], p[2]);
 
                                dr2["Shuffle"] = dr2["Shuffle"] + ", " + txtFirst.Text + " " + txtSecond.Text;
 
                                dt.Rows.Add(dr2);
                            }
                            else
                            {
                                dr2["Shuffle"] = String.Format("{0} {1} {2} ", p[0], p[1], p[2]);
 
                                dt.Rows.Add(dr2);

For two and three combination of names it is displaying but if i try to add for four combination. the combinations are repeating. please help me on this.