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System.NotSupportedException: SQL Server does not handle comparison of NText, Text, Xml, or Image data types.

While updating in SQL server via LINQ to SQL sometimes you get the exception: “System.NotSupportedException: SQL Server does not handle comparison of NText, Text, Xml, or Image data types”

To fix this exception let’s see the possible solutions:

Solution 1:
If you are getting this exception with NText, Text, or Image data type fields, the reason is that NText, Text and Image types are deprecated and these fields must be replaced with the NVARCHAR(MAX), VARCHAR(MAX) and VARBINARY(MAX) types respectively. These types support string operators, including equality comparison. And you should be fine then.

Solution 2:
If you are getting this exception with XML field of your table, then reason is XML field can never be compared as a string. In order to fix this issue open the dbml file with xml editor and set the “updatecheck” to “Never” as follows:

<column canbenull="true" dbtype="Xml" name="PermissionsXml" 
type="System.Xml.Linq.XElement" updatecheck="Never"></column>

Hope that helps J
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