ADO.NET ExecuteScalar in SqlCommand Object
ExecuteScalar() in SqlCommand Object is used for get a single value from Database after its execution. It executes SQL statements or Stored Procedure and returned a scalar value on first column of first row in the Result Set. If the Result Set contains more than one columns or rows , it takes only the first column of first row, all other values will ignore. If the Result Set is empty it will return a Null reference.
It is very useful to use with aggregate functions like Count(*) or Sum() etc. When compare to ExecuteReader() , ExecuteScalar() uses fewer System resources.
connetionString = "Data Source = ServerName; Initial Catalog = DatabaseName; User ID = UserName; Password = Password"
sql = "Your SQL Statement Here like Select Count(*) from product"
You have to replace the string with your realtime variables.
- ADO.NET Connection Object
- ADO.NET SQL Server Connection
- ADO.NET OLEDB Connection
- ADO.NET ODBC Connection
- ADO.NET Command
- ADO.NET ExecuteNonQuery in SqlCommand Object
- ADO.NET ExecuteNonQuery in OleDbCommand Object
- ADO.NET ExecuteScalar in OleDbCommand Object
- ADO.NET ExecuteReader in SqlCommand Object
- ADO.NET ExecuteReader in OleDbCommand Object
- How to ADO.NET DataReader
- How to ADO.NET SqlDataReader
- How to ADO.NET OleDbDataReader
- How to Multiple Result Sets in ADO.NET
- Getting Schema Informations from SqlDataReader
- Getting Schema Informations from OleDbDataReader
- What is DataAdapter
- What is SqlDataAdapter
- What is OleDbDataAdapter
- Vb.NET ExecuteReader and ExecuteNonQuery