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I needed to remove the content editor dropdown you sometimes see in the form.
The most efficient way to do this is to add een Content Editor WebPart to the form of your list.
This way you could also add any javascript to your edit form, or other things to your page.

Here is the code:

SPList list = web.Lists[LIST_NAME];
string EditFormURL = list.DefaultEditFormUrl;

web.AllowUnsafeUpdates = true;

SPFile file = web.GetFile(EditFormURL);

if (null != file)
{
      using (SPLimitedWebPartManager mgr = file.GetLimitedWebPartManagerPersonalizationScope.Shared))
{
if (null != mgr)
{
//create new webpart object
ContentEditorWebPart contentEditor = new ContentEditorWebPart();
//Add content to CEWP
XmlDocument xmlDoc = new XmlDocument();
XmlElement xmlElement = xmlDoc.CreateElement(“Root”);
xmlElement.InnerText = GetValidationScript().ToString();
contentEditor.Content = xmlElement;contentEditor.Content.InnerText = xmlElement.InnerText;

//Add it to the zone
mgr.AddWebPart(contentEditor, “0”, 0);
web.Update();

}
}
}
}

private StringBuilder GetValidationScript()
{

StringBuilder sbScript = new StringBuilder();
string sJQueryURL = “_layouts/JQuery.js”;//exact path of your js file
sbScript.Append(“<script src='” + sJQueryURL + “‘type=’text/javascript’></script>”);
sbScript.Append(“<script type=’text/javascript’>”);
sbScript.Append(“$(document).ready(function() { “);
sbScript.Append(@” $(‘select[id*=””ContentTypeChoice””]’).parent().parent().hide();”);
sbScript.Append(“}); “);
sbScript.Append(“</script>”);
return sbScript;

}