I Tried My Code But When I Run It Shows Error

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C#5.0

Link button code as follows

protected void lnkCbndate_Click(object sender, EventArgs e)
 {
     GridViewRow gv = (GridViewRow)((LinkButton)sender).NamingContainer;
     LinkButton lnkselectedrow = sender as LinkButton;

    if (lnkselectedrow != null)
      {
        GridView gvpkgname = (GridView)gv.FindControl("cpm_pkg_id");

        if (gvpkgname != null)
         {

            LinkButton btn = (LinkButton)gv.FindControl("cpm_pkg_id");
            String sql;
            SqlDataReader dr;
            sql = "OH_PKG_DATE_COMBINATION '" + "cpm_pkg_id" + "'";
            dr = scon.ReadSql(sql);
            gvpkgname.DataSource = dr;
            gvpkgname.DataBind();
         }
      }

 }

ASp.net page source code as follows

  <asp:LinkButton ID="lnkCbndate" Text="Show available Combination batch dates" OnClick="lnkCbndate_click"

CommandName='<%#DataBinder.Eval( Container.DataItem, "cpm_pkg_id") %>'
                                                                                CommandArgument='<%#DataBinder.Eval( Container.DataItem, "cpm_pkg_name") %>' runat="server">

When i run shows error as follows

it does not contain a definition for lnkCbndate_click (link button)

from my above code what is the mistake i made?

please help me.