The IsDBNull method in C# is a member of the SqlDataReader class in the System.Data.SqlClient namespace. It is used to check if the value of a column in the current row is null or not. This method returns a boolean value that indicates whether the specified column's value is DBNull or not. If the value is DBNull, it returns true; otherwise, it returns false. This method is commonly used when working with databases to handle null values efficiently.
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