Question

I am trying to add Checkboxes dynamically to webpage

            string[] words = masg.Split('~');
            int size = words.Length;
            CheckBox[] cbl = new CheckBox[size];
            for (int i = 0; i < words.Length; i++)
            {
                cbl[i] = new CheckBox();
                cbl[i].Text = words[i].ToString();
                this.Controls.Add(cbl[i]);  
               // Response.Write("\n" + words[i]);
            }

I am getting error

Control ‘ctl01’ of type ‘CheckBox’ must be placed inside a form tag with runat=server.

How should I proceed ? What changes to make on aspx page ? Please help.

Answer 1

You should change it to add in form, because this is referencing your Page. and any server control which you are creating programmatic or by adding on page with runat="server" should place inside a form tag.

like

this.Form.Controls.Add(cbl[i]);

or place a placeholder or panel on the form. and than you can add in it

like

placeholder1.Controls.Add(cbl[i]); 

If your .aspx does not contain a form tag, then you should place a form tag there

like

<form runat="server" id="form1">

 //Other mark up or server controls.

</form>