This process is possible with repeater

protected void btnAddImpDate_Click(object sender, EventArgs e)
        {

            
            #region DataGrid  Code By Rajesh
            if (ViewState["dtkeychanneldate"] != null)
            {
                DataTable dt1 = (DataTable)ViewState["dtkeychanneldate"];
                dtKeyChannelDetails = dt1;
                dtKeyChannelDetails.AcceptChanges();
            }

            int srNo = 0;
            if (dtKeyChannelDetails.Rows.Count > 0)
            {
                srNo = Convert.ToInt32(dtKeyChannelDetails.Compute("MAX(ID)", ""));
            }
            DataRow dr1 = dtKeyChannelDetails.NewRow();
            dr1["ID"] = srNo + 1;
            if (KeychannelEditID.Value.ToString() != "")
            {
                dr1["intKeyChanPartId"] = KeychannelEditID.Value.ToString();
                dr1["varCreatedBy"] = Session["UserId"].ToString();
                dr1["bitIsActive"] = "true";
                dr1["dateCreatedOn"] = DateTime.Now.ToString();
            }
            if (txtImpDate.Text.ToString() != "")
            {
                dr1["dtImpDate"] = txtImpDate.Text;//Impdate.ToString("dd/MM/yyyy");
            }

            //DGKumar
            string chklistImpItems = "";
           
            //End

          
             
            
                for (int i = 0; i < chklistImpDate.Items.Count; i++)
                {
                    if (chklistImpDate.Items[i].Selected == true)
                        chklistImpItems = chklistImpItems + chklistImpDate.Items[i].Value + ",";

                }
               
                    chklistImpItems = chklistImpItems.Substring(0, chklistImpItems.Length - 1);
                   
                    dr1["intImpGiftId"] = Convert.ToString(chklistImpItems);
                
            
               
                //ScriptManager.RegisterStartupScript(this, Page.GetType(), "Message", "<script language = 'javascript'>alert('Please select anything');</script>", false);
                
            string gftName = "";
            foreach (ListItem li in chklistImpDate.Items)
            {
                if (li.Selected == true)
                {
                    chklistImpDate.SelectedItem.Selected = true;
                    gftName += li.Text.ToString() + ",";
                }
            }
            if (gftName != "")
            {
                dr1["varImpGiftName"] = gftName.Substring(0, gftName.Length - 1);
            }
            dr1["ImpRemarks"] = txtImpRemarks.Text;
            dtKeyChannelDetails.Rows.Add(dr1);
            dtKeyChannelDetails.AcceptChanges();

            ViewState["dtkeychanneldate"] = dtKeyChannelDetails;

            gvKeychanneldates.DataSource = dtKeyChannelDetails;
            gvKeychanneldates.DataBind();
            txtImpDate.Text = "";
            txtImpRemarks.Text = "";
            foreach (ListItem li in chklistImpDate.Items)
            {
                if (li.Selected == true)
                {
                    chklistImpDate.SelectedItem.Selected = false;
                }
            }
            //}
        }
          
            #endregion

       
        protected void gvKeychanneldates_RowCommand(object sender, GridViewCommandEventArgs e)
        {

            #region commented for later use
            if (e.CommandName == "EditActionable")
            {
                Session["dtkeychanneldate"] = "Edit";
                DataTable dummyDT = (DataTable)ViewState["dtkeychanneldate"];

                foreach (DataRow dr in dummyDT.Select("ID=" + e.CommandArgument.ToString()))
                {

                    txtImpDate.Text = dr["dtImpDate"].ToString();
                    txtImpRemarks.Text = dr["ImpRemarks"].ToString();
                    //if (dr["intImpGiftId"].ToString().Trim() == "1")
                    //    rdFlower3.Checked = true;
                    //else
                    //    rdFlower3.Checked = false;
                    //if (dr["intImpGiftId"].ToString().Trim() == "2")
                    //    rdGreetingcards3.Checked = true;
                    //else
                    //    rdGreetingcards3.Checked = false;
                    //if (dr["intImpGiftId"].ToString().Trim() == "3")
                    //    rbLetter3.Checked = true;
                    //else
                    //    rbLetter3.Checked = false;
                    //if (dr["intImpGiftId"].ToString().Trim() == "4")
                    //    rdothers3.Checked = true;
                    //else
                    //    rdothers3.Checked = false;
                    btnAddImpDate.ImageUrl = "~/Images/btn-update.gif";
                 //   KeychannelEditID.Value = dr["ID"].ToString();
                }
            }
            #endregion commented for later use

            if (e.CommandName == "DeleteActionable")
            {
                DataTable dummyDT = (DataTable)ViewState["dtkeychanneldate"];
                foreach (DataRow dr in dummyDT.Select("ID=" + e.CommandArgument.ToString()))
                {
                    dummyDT.Rows.Remove(dr);
                }
                dummyDT.AcceptChanges();
                ViewState["dtkeychanneldate"] = dummyDT;
                gvKeychanneldates.DataSource = dummyDT;
                gvKeychanneldates.DataBind();
            }
        
        }

<asp:GridView ID="gvKeychanneldates" runat="server" AutoGenerateColumns="false"
                                            CssClass="smgrid" OnRowCommand="gvKeychanneldates_RowCommand">
                                            <Columns>
                                                <asp:BoundField DataField="ID" HeaderText="Serial No" />
                                                <asp:BoundField DataField="dtImpDate" HeaderText="Important Date" />
                                                <asp:BoundField DataField="intImpGiftId" HeaderText="Gift Id" Visible="false" />
                                                <asp:BoundField DataField="varImpGiftName" HeaderText="Gift Name" />
                                                <asp:BoundField DataField="ImpRemarks" HeaderText="Remark" />
                                                <asp:TemplateField HeaderText="Action">
                                                    <ItemTemplate>
                                                        <asp:LinkButton ID="lnkEdit" runat="server" CommandArgument='<%# Eval("ID")%>'
                                                            CommandName="EditActionable" Text="Edit" Visible="false"></asp:LinkButton>
                                                        <asp:LinkButton ID="lnkDelete" runat="server"
                                                            CommandArgument='<%# Eval("ID")%>' CommandName="DeleteActionable" Text="Delete"></asp:LinkButton>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                            </Columns>
                                        </asp:GridView>