the name 'Rollnumber' does't exist in the current context? why?

Question

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SQL-Server-2008R2

code in bll

C#

public DataSet Find(String str)
       {
           if (str == "")
               throw new Exception("Please provide ID to search");

           DataSet ds = null;
           Dal objdal = new Dal();
           ds = objdal.FindRecord(RollNumber);

           return ds;
       }

code in dal

C#

public DataSet FindRecord(int RollNumber)
        {
            DataSet ds = null;
            try
            {
                string command = "Select * from tblstudent where RollNumber=@RollNumber";
                using (SqlConnection con = new SqlConnection(cs))
                {
                    con.Open();
                    SqlDataAdapter da = new SqlDataAdapter("command", con);
                    
                    ds = new DataSet();
                    da.Fill(ds, "tblstudent");
                    con.Close();
                    
                }
            }
            catch (Exception e)
            {
                string st = e.Message;
                
            }
            return ds;
       }

i have added the references as well why it's giving this error? Please let me know thanks in advance

Posted 1-Nov-14 3:01am

raxhemanth

Updated 1-Nov-14 3:13am

User 11060979

v2

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2 solutions

Solution 2

C#

Public DataSet FindRecord(int RollNumber)
{
try{
string command="select * from tblstudent Where rollnumber=@ROLLNUMBER";
using(sqlcommand cmd=new sqlcommand(command,con){
cmd.parameters.add("@ROLLNUMBER", SqlDbType.Int32)=ROLLNUMBER;
sqldataadapter da=new sqldataadapter(cmd);
dataset ds=new dataset();
da.fill(ds);
return ds;
}
}
}

Posted 1-Nov-14 6:14am

kskumaran

Updated 1-Nov-14 6:20am

v2

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DamithSL · Accepted Answer · 2014-11-01T03:15:00

Solution 1

it seems you need to search based on input str, but your method expect integer value and that RollNumber is not defined. try below ( assume you have numbers as input str)

C#

int RollNumber = Convert.ToInt32(str);
ds = objdal.FindRecord(RollNumber);

Posted 1-Nov-14 3:15am

DamithSL

Comments

raxhemanth 1-Nov-14 9:25am

You are right i have mistaken thankyou DamithSL

Maciej Los 1-Nov-14 12:27pm

+5

DamithSL 1-Nov-14 12:29pm

Thank you Maciej Los

Praveen_P 2-Nov-14 23:48pm

gud solution , +5 !

DamithSL 2-Nov-14 23:53pm

Thank you, Praveepk3