get specified values from database and show on crystal report

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C#

I want to get a specified value from database and show it on database.
I have the following code.

 SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=PFMS;User ID=sa;Password=123!@#abc");
con.Open();
                
int c = 1;
SqlCommand cmd = new SqlCommand("select * from tbl_expense where form_id=" + c , con);
                 
SqlDataAdapter da = new SqlDataAdapter(cmd);
CrystalReport1 rp = new CrystalReport1();
DataSet ds = new DataSet();
            
da.Fill(ds, "tbl_expense");
dt.Load(dr);
rp.SetDataSource(ds);

and it does not show the report. please tell me what i need to do.
thanks in advance