How to Search and Filter data in crystal report from TextBox value in ASP.Net

Try this

   SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ConnectionString);
        SqlCommand command = new SqlCommand("Select top 10 * From Transactions where id = @id", con);
        command.Parameters.AddWithValue("@id", txtId.Text.Trim());
        command.CommandType = CommandType.Text;
        SqlDataAdapter adapter = new SqlDataAdapter(command);
        DataSet dataset = new DataSet();
        adapter.Fill(dataset, "Dataset1");
        ReportDocument MedicalReport = new ReportDocument();
        MedicalReport.Load(Server.MapPath("CrystalReport3.rpt"));
        MedicalReport.SetDataSource(dataset.Tables["Transations"]);
        CrystalReportViewer1.ReportSource = MedicalReport;
        CrystalReportViewer1.DataBind();

If this too does not work then

1. Debug and check the Id in TextBox

2. Use same Id and fire query in sql query analyser