Jul 3, 2009 · Using GetOrdinal allows accessing a reader's column values without having to know exactly where the index position of the value is. GetOrdinal performs a case-sensitive lookup first. If it fails, a second case-insensitive search is made.

Save time by calling GetOrdinal once and assigning the results to an integer variable for use within the loop. Gets the column ordinal, given the name of the column.

Yes they do but you can also use SqlDataReader.GetName(ordinal) and SqlDataReader.GetOrdinal(name). As for performance, I think it's probably extremely insignificant compared to the overhead of say, retrieving the next row of data.

Using the methods of the SqlDataReader, I can get the value of a column by passing in it's ordinal, such as the value of the first column if I pass in read.GetValue(0), or the second column if I pass in read.GetValue(1).

Nov 8, 2022 · When you execute a SQL query and read the results with SqlDataReader, you have two options for getting column values by name (instead of by ordinal number): Use the indexer and cast to the primitive type. Use the Get extension methods (from System.Data) such as GetString (string name). I’ll show examples below.

Use the DataReader.Read method to obtain a row from the query results. You can access each column of the returned row by passing the name or ordinal number of the column to the DataReader.

Save time by calling GetOrdinal once and assigning the results to an integer variable for use within the loop. Gets the column ordinal, given the name of the column.

May 16, 2011 · Using the SqlDataReader class, what, if any, are the functional differences between: (string) dataReader["MyFieldName"]; and dataReader.GetString(dataReader.GetOrdinal("MyFieldName"));

You want to use column ordinals rather than column names to retrieve data from a DataReader to improve application performance and without hard-coding the ordinal values. Solution. Enumerate the column ordinals using the GetOrdinal ( ) method and use those values to retrieve data from the DataReader . The sample code contains two event handlers:

Instead, there is method called GetOrdinal for a datareader, through that you can get the index of the particular column, assign it to an integer variable and access the values through that. Sample code is int tempIndex = dr.GetOrdinal("name"); dr[tempIndex] -> Good Way - …