How can I declare scaler variable

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SqlConnection con = new SqlConnection(@"Data Source=SATYA\SAT;Initial Catalog=record;Integrated Security=True");
                SqlDataAdapter da = new SqlDataAdapter("update  employee set empName=@Name,empContact=@Contact,EmpAddress=@address where empId=@ID", con);
                DataSet ds = new DataSet();
                da.Fill(ds);

                da.UpdateCommand.Parameters.Add("@ID", SqlDbType.Int).Value = emp.Id;
                da.UpdateCommand.Parameters.Add("@Name", SqlDbType.VarChar).Value = emp.Name.ToString();
                da.UpdateCommand.Parameters.Add("@Contact", SqlDbType.Int).Value = emp.Contact;
                da.UpdateCommand.Parameters.Add("@address", SqlDbType.Int).Value = emp.Address;

What I have tried:

It's give exception "

Must declare the scalar variable "@Name"

Posted 9-Mar-19 23:49pm

satyanand mishra

Updated 10-Mar-19 0:01am

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OriginalGriff · Answer 1 · 2019-03-10T00:01:00

Look at your code.
You execute a command on a DataAdapter before you add the parameters.
And you try to fill a DataSet from an UPDATE command, which is weird and unlikely to work.
Use a command instead:

using (SqlConnection con = new SqlConnection(strConnect))
   {
   con.Open();
   using (SqlCommand cmd = new SqlCommand("UPDATE employee SET empName=@Name,empContact=@Contact,EmpAddress=@address WHERE empId=@ID", con);
      {
      cmd.Parameters.AddWithValue("@ID", emp.Id);
      cmd.Parameters.AddWithValue("@Name", emp.Name);
      cmd.Parameters.AddWithValue("@Contact", emp.Contact);
      cmd.Parameters.AddWithValue("@address", emp.Address);
      cmd.ExecuteNonQuery();
      }
   }

And don't hardcode connection strings! Always store them in a config file so that they only need to be changed in one place.