How to use executeReader method to retrieve the value of just one cell

Question

I need to execute the following command and pass the result to a label  I don t know how can i do it using Reader  Someone can give me a hand   String sql    SELECT   FROM learer WHERE learer id       index  SqlCommand cmd   new SqlCommand sql conn   learerLabel Text    String  cmd ExecuteReader      As you can see i create the SQL statement and i execute it  but it does not work  Why   The console says      Cannot implicitly SqlDataReader to   String      How can i get the desired results as String so the label can display it properly

User · Answer

ExecuteScalar   is what you need here

User · Answer

using  var conn   new SqlConnection SomeConnectionString   using  var cmd   conn CreateCommand          conn Open        cmd CommandText    SELECT   FROM learer WHERE id    id       cmd Parameters AddWithValue   id   index       using  var reader   cmd ExecuteReader                  if  reader Read                          learerLabel Text   reader GetString reader GetOrdinal  somecolumn

User · Answer

It is not recommended to use DataReader and Command ExecuteReader to get just one value from the database  Instead  you should use Command ExecuteScalar as following   String sql    SELECT ColumnNumber FROM learer WHERE learer id       index  SqlCommand cmd   new SqlCommand sql conn   learerLabel Text    String  cmd ExecuteScalar        Here is more information about Connecting to database and managing data

User · Answer

Duplicate question which basically says use ExecuteScalar   instead

[c#] How to use executeReader() method to retrieve the value of just one cell

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