Multiple Row Delete Not Working

The method I wrote to delete records is working if there's one record, but not for more than one. This method takes a string, and I've examined what is passed in and everything looks ok, but then no error occurs where there's more than one record, but no delete occurs either.

Here's what I see in my Trace.Warn statement:  Delete From Photo_TBL where PhotoID IN ('223,224')

So the sql looks fine but I can't figure out why it's not working. Here's my method for deleting. Can you see what might be wrong? Thanks

  public void PerformDeletion(string photoID)
{
//Response.Write(photoID);

// Set up SqlCommand, connection to db, sql statement, etc.
SqlCommand DeleteCommand = new SqlCommand();
DeleteCommand.Connection = DBConnectionClass.myConnection;
DeleteCommand.CommandType = CommandType.Text;

// Store Primary Key photoID passed here from DeleteRows_Click
// in a parameter for DeleteCommand
SqlParameter DeletePrimaryKeyParam = new SqlParameter();
DeletePrimaryKeyParam.ParameterName = "@PhotoID";
DeletePrimaryKeyParam.Value = photoID.ToString();

// Insert new parameter into command object
DeleteCommand.Parameters.Add(DeletePrimaryKeyParam);

// Delete row, open connection, execute, close connection
DeleteCommand.CommandText = ("Delete From Photo_TBL where PhotoID IN ('" + photoID + "')");
Trace.Warn(DeleteCommand.CommandText);
// DeleteCommand.Connection.Close();
DeleteCommand.Connection.Open();
DeleteCommand.ExecuteNonQuery();
DeleteCommand.Connection.Close();



// Call BindData so GridView is binded and most recent changes appear
BindData();
}