How do I add a TimeSpan to a time column in SQL Server

I want to do something like the following:

update AutoTagUse set TimeActive = (TimeActive + @OrigTimeActive) where AutoTagUseId = @AutoTagUseId

Where TimeActive is a TIME(0) column in SQL Server, and OrigTimeActive is a TimeSpan variable (in C#).

I'm trying to do this so I can have multiple services updating this value in the database simultaneously without have to lock things down with transactions.

The SQL Server entry to create the column is:

[TimeActive] TIME (0)       
    CONSTRAINT [DF_AutoTagUse_TimeActive] DEFAULT ('00:00:00') NOT NULL,

What I am now trying is:

TimeSpan difference = TimeActive - origTimeActive;
conn.ExecuteScalar("update AutoTagUse set TimeActive = dateadd(SECOND, @OrigTimeActive, TimeActive) where AutoTagUseId = @AutoTagUseId", 
                        new { AutoTagUseId = AutoTagUseId, OrigTimeActive = difference }, transaction);

And I am getting:

System.Data.SqlClient.SqlException
HResult=0x80131904
Message=Argument data type time is invalid for argument 2 of dateadd function.
Source=.Net SqlClient Data Provider

StackTrace:
at Dapper.SqlMapper.ExecuteScalarImpl[T](IDbConnection cnn, CommandDefinition& command)
at Dapper.SqlMapper.ExecuteScalar(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Nullable1 commandTimeout, Nullable1 commandType)
at LicenseLibrary.DataObjects.AutoTagUse.Update(IDbConnection conn, IDbTransaction transaction) in C:\git\Store\LicenseLibrary\DataObjects\AutoTagUse.cs:line 171
at TestLibrary.DataObjects.TestAutoTagUse.<>c.b__2_0(IDbConnection conn) in C:\git\Store\TestLibrary\DataObjects\TestAutoTagUse.cs:line 59
at LicenseLibrary.Database.AzureDataAccess.<>c__DisplayClass11_0.b__0() in C:\git\Store\LicenseLibrary\Database\AzureDataAccess.cs:line 104
at Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy.<>c__DisplayClass1.b__0()
at Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy.ExecuteAction[TResult](Func`1 func)

Being time(0), I'm assuming your interval is SECONDS

You can use DATEADD()

Example

Update AutoTagUse 
   set TimeActive = dateadd(SECOND,@OrigTimeActive,TimeActive) 
 Where AutoTagUseId = @AutoTagUseId