System.Data 2.0.0.0 System.Object To be added. Describes the column metadata of the schema for a database table. Field System.String Returns the string "true" if DBNull is allowed; otherwise "false". Avoid setting AllowDbNull to "true" for primary key columns. A column defined as a primary key can be set to AllowDbNull, but a null value cannot be assigned to it. Specifies whether value DBNull is allowed. 2.0.0.0 Field System.String To be added. Specifies the name of the column in the schema table. 2.0.0.0 Field System.String To be added. Specifies the name of the schema in the schema table. 2.0.0.0 Field System.String To be added. Specifies the name of the table in the schema table. 2.0.0.0 Field System.String To be added. Specifies the name of the column in the schema table. 2.0.0.0 Field System.String To be added. Specifies the ordinal of the column. 2.0.0.0 Field System.String To be added. Specifies the size of the column. 2.0.0.0 Field System.String To be added. Specifies the type of data in the column. 2.0.0.0 Field System.String Returns the string "true" if the column is aliased; otherwise "false". Specifies whether this column is aliased. 2.0.0.0 Field System.String Returns the string "true" if the column is an expression; otherwise "false". Specifies whether this column is an expression. 2.0.0.0 Field System.String Returns the string "true" if the column is a key; otherwise "false". Specifies whether this column is a key for the table. 2.0.0.0 Field System.String The definition of long data is provider-specific. Returns the string "true" if the column contains long data; otherwise "false". Specifies whether this column contains long data. 2.0.0.0 Field System.String Returns the string "true" if a unique constraint applies to this column; otherwise "false". Specifies whether a unique constraint applies to this column. 2.0.0.0 Field System.String To be added. Specifies the non-versioned provider-specific data type of the column. 2.0.0.0 Field System.String To be added. Specifies the precision of the column data, if the data is numeric. 2.0.0.0 Field System.String To be added. Specifies the scale of the column data, if the data is numeric. 2.0.0.0 Field System.String To be added. Specifies the provider-specific data type of the column. 2.0.0.0