ASP.NET

<br />
    // Add DropDownList Control to Placeholder      <br />
      private void CreateDropDownBoxes()<br />
    {<br />
        //int counter= Convert[ViewState ("counter"),Int32];        <br />
        for (int counter = 0; counter <= NumberOfControls; counter++)<br />
        {<br />
            DropDownList ddl = new DropDownList();          <br />
            ddl.ID = "DropDownList_ID" + (counter + 1).ToString();            <br />
            <br />
            ddl.AutoPostBack = true;<br />
            ddl.AppendDataBoundItems = true;<br />
            ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);<br />
            DataTable dt = new DataTable();<br />
            dt = getdata_workspace();<br />
            ddl.DataSource = dt;<br />
            ddl.DataTextField = "displayedname";<br />
            ddl.DataValueField = "id";            <br />
            ddl.DataBind();     <br />
<br />
            phDropDownLists.Controls.Add(ddl);            <br />
            phDropDownLists.Controls.Add(new LiteralControl("<br><br><br>"));           <br />
        }<br />
    }<br />
    public void ddl_SelectedIndexChanged(object sender, EventArgs e)<br />
    {<br />
        int n = this.NumberOfControls;<br />
        for (int i = 0; i < n; i++)<br />
        {<br />
            SqlConnection conn = new SqlConnection(connStr);<br />
            string boxName = "DropDownList_ID" + (i + 1).ToString();<br />
            DropDownList ddl2_ = phDropDownLists.FindControl(boxName) as DropDownList;<br />
<br />
            DropDownList ddl2___ = new DropDownList();          <br />
            ddl2___.ID = "DropDownList__" + (i + 1).ToString();<br />
            ddl2___.AutoPostBack = true;<br />
            ddl2___.AppendDataBoundItems = true;<br />
            ddl2___.EnableViewState = true;<br />
            <br />
            SqlCommand cmd = new SqlCommand("select * from unit where workspaceid='" + ddl2_.SelectedValue + "'", conn);<br />
            conn.Open();<br />
            SqlDataReader dr = cmd.ExecuteReader();<br />
            while (dr.Read())<br />
            {<br />
                ddl2___.Items.Add(dr.GetString(2));              <br />
            }<br />
                                    <br />
           // ddl2___.EnableViewState = true;<br />
            ddl2___.SelectedIndexChanged += new EventHandler(ddl2____SelectedIndexChanged);<br />
            ddl2___.DataTextField = "displayedname";<br />
            ddl2___.DataValueField = "id";<br />
            phTextBoxes.Controls.Add(ddl2___);<br />
            phTextBoxes.Controls.Add(new LiteralControl("<br><br><br>"));<br />
<br />
        }<br />
<br />
               // throw new Exception("The method or operation is not implemented.");<br />
    }<br />
   void ddl2____SelectedIndexChanged(object sender, EventArgs e)<br />
    {<br />
        int n = this.NumberOfControls;          <br />
        for (int i = 0; i < n; i++)<br />
        {<br />
            SqlConnection conn = new SqlConnection(connStr);<br />
            string boxName = "DropDownList__" + (i + 1).ToString();            <br />
            DropDownList ddl2_ = phTextBoxes.FindControl(boxName) as DropDownList;<br />
            DropDownList ddl2___ = new DropDownList();<br />
            ddl2___.SelectedIndexChanged += new EventHandler(ddl2____SelectedIndexChanged);<br />
            ddl2_.ToolTip = "ddl2";<br />
            SqlCommand cmd = new SqlCommand("select * from unitoperation where workspaceid='" + ddl2_.SelectedValue + "'", conn);<br />
            conn.Open();<br />
            SqlDataReader dr = cmd.ExecuteReader();<br />
            while (dr.Read())<br />
            {<br />
              ddl2___.Items.Add(dr.GetString(3));<br />
            }<br />
            phdropdown3.Controls.Add(ddl2___);         <br />
        }<br />
    }    <br />
        <br />
   <code><br />
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