Question

Here is my code but it returns -1 value. The Name field contains a unicode value.

  using (SqlConnection conn = new SqlConnection(connStr))
  {      
      string str = string.Format("select SrNo from Jat where Name=@Name");
      SqlCommand dCmd = new SqlCommand(str, conn);
      try
      {               
          dCmd.Parameters.AddWithValue("@Name","N" +Name);
          int i= dCmd.ExecuteNonQuery();
          return i;
      }
      catch
      { 
           throw; 
      }
   }

Answer 1

there is no need to write down

dCmd.Parameters.AddWithValue("@Name","N" +Name); 

remove “N” from this but it doesnt create nvarchar parameter

dCmd.Parameters.AddWithValue("@Name", Name); 

To create nvarchar type parameter than you can do this

dCmd.Parameters.Add(new SqlParameter("@Name", SqlDbType.NVarChar)).Value = Name; 

this will create nvarchar parameter than you can add this parameter as nvarchar parameter

one more change in code is make use of ExecuteScalar

int i= Convert.ToInt32( dCmd.ExecuteScalar());

make use of ExecuteScalar method rather than ExecuteNonQuey ….becuase non Sclar method return value of you SrNo and NonQuery return you row affected when using update and insert query