DataGrid View multiple data adding

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C#

I want to add more details to a datagrid View .(add more data rows). there are 3 columns of the dataGrid View.Data are not support from a data base source. I get the data from a xml file. I'm trying to do this by using following code.

DataTable dt = new DataTable();


 public void SyncWIthConfigFile()
        {
 initialXmlDoc();
            XmlElement rootElement = xmlCommand.DocumentElement;
            UFCCommand command = new UFCCommand();
            foreach (XmlNode childNode in rootElement.ChildNodes)
            {
                List<ufccommand> commandList = new List<ufccommand>();
                DataRow dr = dt.NewRow();
             
                if (childNode.Name != "_ERD" && childNode.Name!="_DLY")
                {
                    
                    command.Name = childNode.Name;
                    dr["ColName"] = command.Name.ToString();
                    
                     if (childNode.FirstChild.Name == "SET_RESPONSE")
                    {  
                        command.SetValue = childNode.FirstChild.InnerText;
                        dr["ColSetValue"] = command.SetValue.ToString();
                       
                    }
                     if(childNode.LastChild.Name=="GET_RESPONSE")
                    {  
                        command.GetValue = childNode.LastChild.InnerText;
                        dr["ColGetValue"] = command.GetValue.ToString();
                    
                    }
                    dataGridView1.DataSource = dt;
                    
                     }
}
}</ufccommand></ufccommand>

When run this code there was an exception.
"Column 'ColName' does not belong to table ." But my first colunm name is"ColName". I can't understand the wrong.