如何解决ASP.NET新增时多字段取值的问题

<asp:TextBox ID="TextBox2" runat="server" Text="TextBox2" ></asp:TextBox> 
<asp:TextBox ID="TextBox3" runat="server" Text="TextBox3" ></asp:TextBox> 
<asp:Button ID="Button2" runat="server" Text="提交" onclick="Button2_Click" /> 

protected void Button2_Click(object sender, EventArgs e) 
{       
  string colName1 = TextBox2.Text;
  string colName2 = TextBox3.Text;       
  DataSave(colName1,colName2); 
} 

protected void Button2_Click(object sender, EventArgs e) 
 {       
   Dictionary<string, string> entityDic = new Dictionary<string, string>();       
   foreach (Control l in MyPanel.Controls)       
   {         
      if (l is TextBox)         
      {           
       TextBox tb = (l as TextBox);           
       entityDic.Add(tb.GetMapColumnsName(), tb.Text);         
      }       
   }        
   IDBHelper dbHelp = DataBaseProvider.Instance.GetDBHelper("orm");       
   string result = dbHelp.DataSave(entityDic);     
} 

public static class TextBoxEx 
{    
  public static string GetMapColumnsName(this TextBox my)    
  {      
   string myColumnsName = my.ID;      
   //将来文本ID可以为了安全存为加密过的值 这里可以负责解密      
   return myColumnsName;    
  }  
}