insert into database

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I want to insert a record into database and display into gridview
but i am getting error

C#

protected void btnsubmit_Click(object sender, EventArgs e)
       {
           cmp c = new cmp();
           c.EmpName = txtempname.ToString();
           c.jobid = Convert.ToInt32(txtjobid.Text);
           c.managerid = Convert.ToInt32(txtmanagerid.Text);
           c.salary = Convert.ToInt32(txtsalary.Text);
           c.hiredate = Convert.ToDateTime(txthiredate.Text);
           Employee a = new Employee();
           a.insertEmployeeData(c);
       }

in DAl

C#

public void insertEmployeeData(cmp c)
      {
          CompanyDataContext db = new CompanyDataContext();
          var list = db.Employees.Where(p => p.empid == c.Employeeid).FirstOrDefault();
          list.empname = c.EmpName;
          list.jobid = c.jobid;
          list.hiredate = c.hiredate;
          list.salary = c.salary;
          list.managerid = c.managerid;
          db.Employees.InsertOnSubmit(list);
          db.SubmitChanges();
      }

Object reference not set to an instance of an object.

C#

list.empname = c.EmpName;

here i am getting error
plz help
me thanq.

Posted 5-Sep-11 4:14am

sreekanth12

Updated 5-Sep-11 4:35am

Wendelius

v2

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Jassim Makki · Answer 1 · 2011-09-05T16:40:00

var list = db.Employees.Where(p => p.empid == c.Employeeid).FirstOrDefault();

This is your problem .. i believe you are trying to read your record before inserting it.

try to pass the 'cmp' instead of the 'list' like this: (if cmp is not the right object type then use Employee)

public void insertEmployeeData(cmp c)
       {
           CompanyDataContext db = new CompanyDataContext();
           db.Employees.InsertOnSubmit(c);
           db.SubmitChanges();
       }

set the empid for the 'cmp'(or Employee) object if it is not set automatically.

rkthiyagarajan · Answer 2 · 2011-09-05T04:25:00

try this code inserting data in to databse and u have to correct as per your aspects.

C#

protected void Button1_Click(object sender, EventArgs e)
        {
            SqlConnection con;
            SqlCommand cmd;
            //SqlDataReader dr;


            string constr = ConfigurationManager.ConnectionStrings["SomeDataBase"].ToString();
            con = new SqlConnection(constr);


            //con.Open();
            cmd = new SqlCommand("insert into Reg values( @Username,@Password)", con);

            cmd.Parameters.Add("@Username", SqlDbType.VarChar, 20);
            cmd.Parameters["@Username"].Value = TextBox1.Text;

            cmd.Parameters.Add("@Password", SqlDbType.VarChar, 20);
            cmd.Parameters["@Password"].Value = TextBox2.Text;
            int add = 0;
            try
            {
                con.Open();
                add = cmd.ExecuteNonQuery();
                Label5.Visible = true;
                Label5.Text = "Record Addedd";
                Response.Redirect("yourcurrentpage.aspx");
            }
            catch (Exception err)
            {
                Label5.Text = "Record Already existed";
                Label5.Text += err.Message;
            }

            con.Close();

Wendelius · Answer 3 · 2011-09-05T04:48:00

Have you checked that your LINQ query actually returns a row. Since you're using FirstOrDefault, if no records match the Employeeid condition a null reference should be returned.

If I'm reading this correctly the root cause is that in btnsubmit_Click you don't set the c.Employeeid at all. This would explain why the query finds no records.

Since you're inserting a record could you simply create a new employee instance and fill it's properties and pass it on.

insert into database

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