DataSource Controls :: SQL Server Does Not Handle Comparison Of NText, Text / Xml Or Image Data Types

May 24, 2010

I have a bit of code in a clickevent handler like this:-

Dim products = From p In db.Products where p.product_name = "Tool" Select New With {p.Product_ID,p.Product_name}
Gridview1.Datasource = products

But causes error=SQL Server does not handle comparison of NText, Text, Xml, or Image data types?

where product_name field is set as type text

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I've found a lot of similar topics but none of them solves my problem.

I have table structure like that


Everyone suggests to change ntext type to nvarchar(MAX) and life will be beautyfull. But... First, I need
ntext, simply because there should be text in this field.

nvarchar(MAX) equals 4096 bytes which is to small for large text. Second, I already have table with
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Possible Duplicate:

Are there any disadvantages to always using nvarchar(MAX)?

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i have the below query where MessageText column is of ntext datatype..whe n i run the below query it is giving me the below error. Error :The data types ntext and varchar are incompatible in the add operator.

select li.LookUpPageInfoId,
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Data Types Text And Varchar Are Incompatible In The Equal To Operator?

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Here is the code:


Dim intusercount As Integer = 0
Using connection As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True")
Using command As New SqlCommand("SELECT [ID] FROM [Members] WHERE [Username]=@Username AND [Password]=@Password", connection)
command.Parameters.Add("@Username", Data.SqlDbType.VarChar).Value = TextBox1.Text
command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text
intusercount = command.ExecuteScalar
If intusercount > 0 Then
End If
End Using
End Using

The data types text and varchar are incompatible in the equal to operator.

Source Error:

Line 11: command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text
Line 12: connection.Open()
Line 13: intusercount = command.ExecuteScalar
Line 14: connection.Close()
Line 15: If intusercount > 0 Then


[SqlException (0x80131904): The data types text and varchar are incompatible in the equal to operator.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +2030802
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +5009584
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2275
System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
System.Data.SqlClient.SqlDataReader.get_MetaData() +86
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +311
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +987
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
System.Data.SqlClient.SqlCommand.ExecuteScalar() +139
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System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

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So admitingly I am fairly new at .NET...I have been a PHP guy for rather long time...

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Essentially what I am trying to do is query the SQL database by the username. This above code is a method within the user respository for fetching a user by their username. The variable "username" is passed in as a string.

When the method is called a recieve the following error:

The data types text and varchar are incompatible in the equal to operator.

This to me is rather confusing since the field in the database, user_username, is a text and the variable passed in, as said, is a string. They should be synonomous for all practical purposes.

Ideas? Thoughts? Fixes?

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