how to create a dynamic path for crystal report in windows application forms using with c#.net

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C#

C#4.0

i have write the following code but not works.it display an error like load report failed .please rectify my error
var connectionString = ConfigurationManager.ConnectionStrings["smssms"].ConnectionString;
SqlConnection cn = new SqlConnection(connectionString);

string sql = "select * from entryform ";

// SqlConnection connection = new SqlConnection(connectionString);
cn.Open();
SqlCommand sCommand = new SqlCommand(sql, cn);
SqlDataAdapter sda = new SqlDataAdapter(sCommand);
SqlCommandBuilder sBuilder = new SqlCommandBuilder(sda);
DataSet sDs = new DataSet();
sda.Fill(sDs, "smssms");
DataTable dt = sDs.Tables["smssms"];
ReportDocument cryRpt = new ReportDocument();
// cryRpt.Load("C:\\Users\\user\\Documents\\Visual Studio 2010\\Projects\\cryconnection\\cryconnection\\CrystalReport1.rpt");
string _cReportPath = string.Format("{0}\\Reports\\{1}", Application.StartupPath, "CrystalReport1.rpt");
// cryRpt.Load(Application.StartupPath + "CrystalReport1.rpt");
cryRpt.Load(_cReportPath );
crystalReportViewer1.ReportSource = cryRpt;
// crystalReportViewer1.LogOnInfo[0].ConnectionInfo.IntegratedSecurity = true;
crystalReportViewer1.Refresh();
cn.Close();