how to create insert update delete data in the DetailsView without saving in the database (using viewstate)?

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C#

ASP.NET

DetailsView

I have made a DetailsView which in DetailsView there is action to insert data, update data and delete data .. how to insert, update, delete data in the DetailsView without saving in database? so far I use viewstate, but I do not know how to apply it in DetailsView .. please help me .. how to create insert update delete without saving in database? Can use viewstate ?

 private void Bindemptydt()
{
    //Declare a datatable for the gridview
    DataTable dt = new DataTable();
    //Add Columns to the datatable
    dt.Columns.Add("report_id");
    dt.Columns.Add("param_field");
    dt.Columns.Add("param_label");
    dt.Columns.Add("param_type");
    dt.Columns.Add("param_objtype");
    dt.Columns.Add("format");
    dt.Columns.Add("param_query");
    dt.Columns.Add("default");
    dt.Columns.Add("koneksi");
    dt.Columns.Add("looping");
    dt.Columns.Add("urut");
    //Define a datarow for the datatable dt
    DataRow dr = dt.NewRow();

    //Now add the datarow to the datatable
    dt.Rows.Add(dr);
    //Now bind the datatable to gridview
    DetailsView1.DataSource = dt;
    DetailsView1.DataBind();
    //Now hide the extra row of the grid view
    DetailsView1.Rows[0].Visible = false;
    //Delete row 0 from the datatable
    dt.Rows[0].Delete();
    dt.AcceptChanges();
    //View the datatable to the viewstate
    ViewState["RptParam"] = dt;
}