Implicit conversion from data type sql_variant to uniqueidentifier is not allowed. Use the CONVERT function to run this query

Question

I am creating a website now using Microsoft Visual Web Developer 2010 Express and I used the toolbox of \"createUserWizard\". Then I put the userId

Answer 1

If you want to insert GUID from your code, you should make parameter type GUID

<asp:Parameter Name="ParamName" DbType="Guid" />

And you should pass GUID value as (c#):

SqlDataSource1.InsertParameters["ParamName"].DefaultValue = System.Guid.NewGuid().ToString();

If you want to pass a string value, you have to use CONVERT(UNIQUEIDENTIFIER,'YOUR VALUE') in the insert query like this:

InsertCommand="INSERT INTO [Order] ([UserId], [etc]) 
VALUES (CONVERT(UNIQUEIDENTIFIER,@UserId), @etc)"