ASP.Net สอบถามวิธีการทำ Crystal Report จากข้อมูลใน GridView ครับ ^ ^"

using System;
using System.Data;
using System.Web.UI.WebControls;

protected void Page_Load(object sender, EventArgs e)
{
     if (!IsPostBack)
   {
               BindGridview();
               BindSecondGrid();
   }
}

protected void BindGridview()
{
            DataTable dt = new DataTable();
            dt.Columns.Add("UserId", typeof(Int32));
            dt.Columns.Add("UserName", typeof(string));
            dt.Columns.Add("Education", typeof(string));
            dt.Columns.Add("Location", typeof(string));
            DataRow dtrow = dt.NewRow();    
            dtrow["UserId"] = 1;         
            dtrow["UserName"] = "SureshDasari";
            dtrow["Education"] = "B.Tech";
            dtrow["Location"] = "Chennai";
            dt.Rows.Add(dtrow);
            dtrow = dt.NewRow();               
            dtrow["UserId"] = 2;             
            dtrow["UserName"] = "MadhavSai";
            dtrow["Education"] = "MBA";
            dtrow["Location"] = "Nagpur";
            dt.Rows.Add(dtrow);
            dtrow = dt.NewRow();             
            dtrow["UserId"] = 3;              
            dtrow["UserName"] = "MaheshDasari";
            dtrow["Education"] = "B.Tech";
            dtrow["Location"] = "Nuzividu";
            dt.Rows.Add(dtrow);
            gvDetails.DataSource = dt;
            gvDetails.DataBind();
}
protected void chkSelect_CheckChanged(object sender, EventArgs e)
{
          GetSelectedRows();
          BindSecondGrid();
}
protected void BindSecondGrid()
{
         DataTable dt = (DataTable)ViewState["GetRecords"];
         gvTranferRows.DataSource = dt;
         gvTranferRows.DataBind();
}
private void GetSelectedRows()
{
            DataTable dt;
          if (ViewState["GetRecords"] != null)
     {
              dt = (DataTable)ViewState["GetRecords"];
     }
          else
     {
              dt = CreateTable();
     }
         for (int i = 0; i < gvDetails.Rows.Count; i++)
    {
              CheckBox chk = (CheckBox)gvDetails.Rows[i].Cells[0].FindControl("chkSelect");
         if (chk.Checked)
        {
              dt = AddGridRow(gvDetails.Rows[i], dt);
         }
         else
        {
             dt = RemoveRow(gvDetails.Rows[i], dt);
        }
   }
          ViewState["GetRecords"] = dt;
}

private DataTable CreateTable()
{
     DataTable dt = new DataTable();
     dt.Columns.Add("UserId");
     dt.Columns.Add("UserName");
     dt.Columns.Add("Education");
     dt.Columns.Add("Location");
     dt.AcceptChanges();
     return dt;
}

private DataTable AddGridRow(GridViewRow gvRow, DataTable dt)
{
         DataRow[] dr = dt.Select("UserId = '" + gvRow.Cells[1].Text + "'");
     if (dr.Length <= 0)
   {
           dt.Rows.Add();
           int rowscount = dt.Rows.Count - 1;
           dt.Rows[rowscount]["UserId"] = gvRow.Cells[1].Text;
           dt.Rows[rowscount]["UserName"] = gvRow.Cells[2].Text;
           dt.Rows[rowscount]["Education"] = gvRow.Cells[3].Text;
           dt.Rows[rowscount]["Location"] = gvRow.Cells[4].Text;
           dt.AcceptChanges();
    }
              return dt;
}

private DataTable RemoveRow(GridViewRow gvRow, DataTable dt)
{
            DataRow[] dr = dt.Select("UserId = '" + gvRow.Cells[1].Text + "'");
       if (dr.Length > 0)
    {
              dt.Rows.Remove(dr[0]);
              dt.AcceptChanges();
    }
            return dt;
}