I Tried But I Am Get The Output Adding Listbox An Ddropdownlist In Gridview

  protected void Page_Load(object sender, EventArgs e)
    {

        Lstfaculty.Items.Add("Raj");
        Lstfaculty.Items.Add("suresh");
        Lstfaculty.Items.Add("Gopi");
        Lstfaculty.Items.Add("Vignesh");
        Lstfaculty.Items.Add("Ram");

        Lstfacid.Items.Add("1");
        Lstfacid.Items.Add("2");
        Lstfacid.Items.Add("3");
        Lstfacid.Items.Add("4");
        Lstfacid.Items.Add("5");

        SetInitialRow();

    }
    

 private ArrayList GetData()
    {
        ArrayList arr = new ArrayList();
        arr.Add(new ListItem("Excellent", "1"));
        arr.Add(new ListItem("Good", "2"));
        arr.Add(new ListItem("Fair", "3"));
        arr.Add(new ListItem("Poor", "4"));
        return arr;
    }

    
    private void dropdownfill(DropDownList Dname)
    {
        if (Dname != null)
        {
            
            List<string> strval = new List<string>();
           
            strval.Add("---Select Grading---");
            strval.Add("Excellent");
            strval.Add("Good");
            strval.Add("Fair");
            strval.Add("Poor");
            Dname.DataSource = strval;
            Dname.DataBind();
        }
    }


    private void FillDropdownlist(DropDownList ddl)
    {
        ArrayList arr = GetData();
        foreach (ListItem item in arr)
        {
            ddl.Items.Add(item);
        }
    }


private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("Faculty Name", typeof(string)));
        dt.Columns.Add(new DataColumn("Faculty ID", typeof(string)));
        dt.Columns.Add(new DataColumn("DropDownList1", typeof(string)));
        dt.Columns.Add(new DataColumn("DropDownList2", typeof(string)));
        dt.Columns.Add(new DataColumn("DropDownList3", typeof(string)));
        dt.Columns.Add(new DataColumn("DropDownList4", typeof(string)));
        dt.Columns.Add(new DataColumn("DropDownList5", typeof(String)));


        //Retrieving the faculty name from listbox

        DataTable dt1 = new DataTable();
        Lstfaculty.DataSource = dt1;
        Lstfaculty.DataTextField = "Faculty";
        Lstfaculty.DataValueField = "Faculty";
        Lstfaculty.DataBind();
        int i = 0;
        for (i = 0; i < Lstfaculty.Items.Count; i++)
        {
            dr = dt.NewRow();
            dr["Faculty Name"] = Lstfaculty.Items[i].Text.ToString();
            dt.Rows.Add(dr);
            
        }
        gvfaculty.DataSource = dt;
        gvfaculty.DataBind();

     
        for (i = 0; i < Lstfaculty.Items.Count; i++)
        {
        DropDownList ddl1 = (DropDownList)gvfaculty.Rows[i].FindControl("DropDownList1");
        DropDownList ddl2 = (DropDownList)gvfaculty.Rows[i].FindControl("DropDownList2");
        DropDownList ddl3 = (DropDownList)gvfaculty.Rows[i].FindControl("DropDownList3");
        DropDownList ddl4 = (DropDownList)gvfaculty.Rows[i].FindControl("DropDownList4");
        DropDownList ddl5 = (DropDownList)gvfaculty.Rows[i].FindControl("DropDownList5");
        FillDropdownlist(ddl1);
        FillDropdownlist(ddl2);
        FillDropdownlist(ddl3);
        FillDropdownlist(ddl4);
        FillDropdownlist(ddl5);
        }

        //Retrieving the faculty id from listbox to gridview 

        DataTable dtfacid = new DataTable(); //added
        ListBox2.DataSource = dtfacid;
        ListBox2.DataTextField = "Facid";
        ListBox2.DataValueField = "Facid";
        ListBox2.DataBind();
        int j = 0;
        for (j = 0; j < ListBox2.Items.Count; j++)
        {
            dr = dt.NewRow();
            dr["Faculty ID"] = ListBox2.Items[j].Text.ToString();
            dtfacid.Rows.Add(dr);
        }
      
        Gridviewimage.DataSource = dt;
        Gridviewimage.DataBind(); 

    }