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The datatype of column <Columnname> in the <Tablename> table can't be changed because it participates in index <Indexname>.

Visual Studio .NET 2003

The sum of the lengths of all columns in an index can not exceed 256 bytes. Changing to the specified datatype would exceed the maximum index size of <3d> bytes.

For more information, see Changing the Data Type Assigned to a Column and Creating an Index.

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