I've created a custom control that works perfectly in every way except that it causes page validation to fire and I don't want it to.  I have not been able to figure out how to make this control not cause validation.

The control derives from Control and implements the IPostBackDataHandler and IValidator interfaces.  Initially, the Render method writes a textbox and a button to the output stream like so:

            StringBuilder sb = new StringBuilder();

            // textbox
            sb.Append("<input id=\"");
            sb.Append(this.UniqueID);
            sb.Append("_txtSearch");
            sb.Append("\" ");
            sb.Append("name=\"");
            sb.Append(this.UniqueID);
            sb.Append(":txtSearch");
            sb.Append("\" ");
            sb.Append("type=\"text\" ");
            sb.Append("onKeyDown=\"return catchEnterKey(window.event,'");
            sb.Append(this.UniqueID);
            sb.Append(":btnSearch');\"");

            if (this.ReadOnly)
            {
                sb.Append(" disabled=\"disabled\"");
            }

            sb.Append(">");

            // button
            sb.Append("<input ");
            sb.Append("type=\"submit\" ");
            sb.Append("name=\"");
            sb.Append(this.UniqueID);
            sb.Append("\" ");
            sb.Append("value=\"Bill-To\" ");
            sb.Append("id=\"");
            sb.Append(this.ClientID);
            sb.Append("\" ");
           
            sb.Append("class=\"button_default\"");
            if (this.ReadOnly)
            {
                sb.Append(" disabled=\"disabled\"");
            }
            sb.Append(">");
           
            return sb.ToString();

When the user enters text in the textbox and then clicks the button, the control catches the postback, and using the text does a db query and then the Render method outputs a dropdownlist with the query results in it.  All this works with no problems.  The issue being when the user clicks the button and postback occurs page validation is occuring.  So if I put my custom control in the middle of a form then the user is being told they have to put values in fields they haven't gotten to yet.

What I believe is happening is that on postback the framework sees that an "input type=submit" caused the postback. It then looks in the control collection for the control with the same id as the input that caused the postback.  Then it checks the CausesValidation of that control and calls Page.Validate if it's set to true OR if it doesn't find the control (since the default for CausesValidation is True).

As you can see from the code above the button is being rendered with the same id as the control itself so that the page will check the controls CausesValidation property.  Unfortunately this doesn't seem to work.  I've tried dozens of different methods and I'm at a total loss.  Can someone PLEASE help with this?

Thanks