Conversion failed when converting from a character string to uniqueidentifier.

Posted on 2009-05-07
Medium Priority
Last Modified: 2012-05-06
I am trying to pass a parameter from ASP.NET to a SQL Server Stored procedure.

string strUserID = currentUser.ProviderUserKey.ToString();
Returns "ba275a68-9e77-4301-9d97-7cc7dfecda0d"

SqlCommand cmd = new SqlCommand("usp_addWatchList", conStockSelect);

cmd.Parameters.Add("@UserID", SqlDbType.VarChar).Value = strUserID;
Conversion failed when converting from a character string to uniqueidentifier.

Stored procedure executes successfully from SQL Server Manager
ALTER PROCEDURE [dbo].[usp_addWatchList]
@SymbolID int,
@UserID varchar(50)    

exec usp_addWatchList  
@SymbolID =329,
@UserID = 'BA275A68-9E77-4301-9D97-7CC7DFECDA0D'              

What am I missing?

Question by:Dovberman
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LVL 12

Expert Comment

ID: 24331093
when adding the parameter it should be passed as SqlDbType.UniqueIdentifier
 Like this:
cmd.Parameters.Add("@UserID", SqlDbType.UniqueIdentifier).Value = strUserID;
LVL 12

Expert Comment

ID: 24331109
sorry - don't think I read it properly - the other problem you could be having is it not putting the value into the parameter right. I always add parameters like this:
cmd.Parameters.AddWithValue("@UserID", strUserID);
I've had problems in the past the other way where the value was not actually stored in the parameter object properly.
LVL 12

Accepted Solution

GuitarRich earned 1000 total points
ID: 24331124
one final thing - it could be in the stored proc when you compare the table field to @UserID - if the table field is a UniqueIdentifier that will fail. Change the parameter in the stored proc to a UniqueIdentifier and add the parameter as System.UniqueIdentifier
Theres a few things to look at anyway :)

Author Comment

ID: 24331502
I set everything to uniqueidentifier.
Error: Failed to convert parameter value from a String to a Guid.

Also tried cmd.Parameters.AddWithValue("@UserID", strUserID);

Error:Conversion failed when converting from a character string to uniqueidentifier.

Author Comment

ID: 24331671
I set everything to uniqueidentifier.

Also tried cmd.Parameters.AddWithValue("@UserID", strUserID);
AND changed the sp from this:

To this:

Now it works.

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