protected void btn_load_report_Click(object sender, EventArgs e)
{
    //string QN = txtQuote_No.Text;
    if (txtQuote_No.Text == "")
    {
        Response.Write("<script>alert('Please enter Quotation Number')</script>");
    }
    else
    {
        //LoadTicketsReport();
        //ViewReport();
        DataTable dt = GetReport();
        ReportViewer1.Visible = true;
        ReportViewer1.LocalReport.ReportPath = Server.MapPath("/Report/Pavsquotation.rdlc");
        ReportViewer1.LocalReport.DataSources.Clear();
        ReportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", dt));
    }
}

private DataTable GetReport()
{
    DataTable ResultTable = new DataTable();
    string connstr = System.Configuration.ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlConnection conn = new SqlConnection(connstr);
    SqlCommand cmd = new SqlCommand("QuotationMaster", conn);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@QuotationNo", txtQuote_No.Text);
    SqlDataAdapter adp = new SqlDataAdapter(cmd);
    adp.Fill(ResultTable);
    return ResultTable;
}