The SqlCommand.ExecuteScalar method in C# is used to execute a SQL query and retrieve a single value from a database. This method is typically used when the SQL query returns a single value, such as an aggregate function result or a count of records. The method returns the first column of the first row of the result set as an object, which can be explicitly cast to the desired data type. This method is commonly used in scenarios where you only need a single value from the database, rather than a full result set.
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