how to define datakey value in imagebutton click

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ASP.NET

protected void Imgbtnsave_Click(object sender, ImageClickEventArgs e)
        {
            
            MySqlConnection StrConnection = null;
            MySqlCommand StrCommand = null;
            



            try
            {
                StrConnection = new MySqlConnection();
                StrConnection.ConnectionString = StrConn;
                StrConnection.Open();

                StrCommand = new MySqlCommand();
                StrCommand.CommandType = CommandType.StoredProcedure;
                StrCommand.CommandText = "Select_LastDate_Result";
                StrCommand.Connection = StrConnection;

                StrCommand.Parameters.AddWithValue("_DiseaseId", ddlselectdisease.SelectedValue);
               
                StrCommand.Parameters.AddWithValue("_Branch_Id", 1);
                StrCommand.Parameters.AddWithValue("_Tenant_Id", 1);
                StrCommand.Parameters.AddWithValue("_Patient_Id", 1);
              

                StrCommand.ExecuteNonQuery();
                BindCarePlan();
            }
            catch (Exception ex)
            {
                obj.InfoEntry(DateTime.Now + "     " + "BtnSave1_Click" + "     " + "AccountBalance.aspx" + "     " + ex.Message, "");
                obj.InfoEntry(DateTime.Now + "     " + ex.StackTrace, "");
                Session["strerrormsg"] = DateTime.Now + "     " + "BtnSave1_Click" + "     " + "AccountBalance.aspx" + "     " + ex.Message;
                Session["strerrortrace"] = DateTime.Now + "     " + ex.StackTrace;
                Response.Redirect("ErrorPage.aspx");
            }
            finally
            {

                StrConnection.Close();
                StrConnection.Dispose();




            }
          
        }


    }

i want to define ParameterId as Datakey value for this image button ...how i can i difine..syntax..
as we r defining like this

string ParameterId = Convert.ToString(grdcareplan.DataKeys[e.RowIndex].Value);

in edit delete functionality of gridview..