How to delete a button control?

I have following code:

 private void BuildPostSurveyQuestionTable(int ID)
   {
// I create a new  table here each time whenever I call this BuildPostSurveyQuestionTable



               HtmlTableCell cellCommand;
               HtmlTableRow rowCommand;
               ValidationSummary valsum = new ValidationSummary();
               valsum.ValidationGroup = "submit";
               valsum.ShowMessageBox = false;
               valsum.ShowSummary = false;
               cellCommand = new HtmlTableCell();
               cellCommand.ColSpan = 3;
               cellCommand.Align = "right";
               Label lblSubmitStatusPost = new Label();
               lblSubmitStatusPost.ID = "lblSubmitStatusPost";
               Button btnSubmitPost = new Button();
               btnSubmitPost.Text = "Save";
               btnSubmitPost.CommandArgument = ID.ToString();
               btnSubmitPost.Click += new EventHandler(btnSubmitPost_Click);
               btnSubmitPost.ValidationGroup = "submit";
               cellCommand.Controls.Add(valsum);
               cellCommand.Controls.Add(lblSubmitStatusPost);
               cellCommand.Controls.Add(btnSubmitPost);
               rowCommand = new HtmlTableRow();
               rowCommand.Cells.Add(cellCommand);
               tblEvaluation.Rows.Add(rowCommand);

}
I have to call this code multiple times. But its works fine the first time only, when I call it second time it doesn't jump on btnSubmitPost_Click(),  after clicking the button it should jump to btnSubmitPost_Click()  every time but why it only works for first survey only and not  for the second one? Do I need to destroy btnSubmitPost control everytime? how do i do this?

how do I create a control with the same name again?  how do I destroy the previous one?

Thanks