how to get selected values of one grid to another grid in same winform

how to get selected values of one grid to another grid in same winform ?

this is what I have but this is a grid to another Checkboxlist. I transformed the checkboxlist in a Radgrid in the ASPX but I dont know what I have to change in the CS Code.

 protected void ButtonALL_OnClick(object sender, EventArgs e)
        {

            ButtonALL.BackColor = System.Drawing.Color.PaleGreen;
            ButtonALL.BorderColor = System.Drawing.Color.Green;
            ButtonALL.ForeColor = System.Drawing.Color.Black;
            if (ButtonALL.Text == "Update")
            {

                ButtonALL.Text = "Updated";
            }
            else
            {

                ButtonALL.Text = "Update";
            }


            foreach (GridItem item in ChangedList.MasterTableView.Items)
            {
                GridDataItem dataitem = (GridDataItem)item;
                TableCell cell = dataitem["GridClientSelectColumn"];
                CheckBoxList checkBox = (CheckBoxList)cell.Controls[0];


                if (.Checked)
                {

                    string value = dataitem.GetDataKeyValue("Logging_ID").ToString();
                    string text = dataitem.GetDataKeyValue("ModuleName").ToString() + ", " + dataitem.GetDataKeyValue("AssemblyVersion").ToString();



                }


                DataTable dt = new DataTable();
                dt.Columns.Add("AssemblyVersion", typeof(string));
                dt.Columns.Add("ModuleName", typeof(int));


                DataRow dr = dt.NewRow();



                dr = dt.NewRow();

                dt.Rows.Add(dr);


                Updatelist.DataSource = dt;
                Updatelist.DataBind();


            }

            pnlNoItems.Visible = (Updatelist.Items.Count == 0);
            pnlTarget.Visible = !pnlNoItems.Visible;



}