SELECT
               t.TABLE_NAME
              ,c.COLUMN_NAME
              ,c.TABLE_CATALOG
              ,c.TABLE_SCHEMA
FROM
              INFORMATION_SCHEMA.COLUMNS AS c JOIN
              INFORMATION_SCHEMA.TABLES AS t
                      ON t.TABLE_NAME = c.TABLE_NAME
WHERE
               COLUMNPROPERTY(OBJECT_ID(c.TABLE_NAME)
                      ,c.COLUMN_NAME,'IsIdentity') = 1 AND
               t.TABLE_TYPE = 'Base Table' AND
               t.TABLE_NAME NOT LIKE 'dt%' AND
               t.TABLE_NAME NOT LIKE 'MS%' AND
               t.TABLE_NAME NOT LIKE 'syncobj_%'

DECLARE @sql NVARCHAR(MAX) = N'';

SELECT @sql += N'TRUNCATE TABLE ' + QUOTENAME(s.name) + N'.'
  + QUOTENAME(t.name) + N';' + CHAR(13) + CHAR(10)
FROM sys.tables AS t
INNER JOIN sys.schemas AS s
ON t.[schema_id] = s.[schema_id]
INNER JOIN sys.identity_columns AS ic
ON t.[object_id] = ic.[object_id]
INNER JOIN sys.partitions AS p
ON p.[object_id] = t.[object_id]
WHERE p.[rows] = 0 -- only empty tables
AND p.index_id IN (0,1)
AND p.partition_number = 1;

PRINT @sql;
-- EXEC sys.sp_executesql @sql;

DECLARE @sql NVARCHAR(MAX) = N'';

SELECT @sql += N'DBCC CHECKIDENT(N''' + QUOTENAME(s.name) + N'.'
  + QUOTENAME(t.name) + N''', RESEED);' + CHAR(13) + CHAR(10)
FROM sys.tables AS t
INNER JOIN sys.schemas AS s
ON t.[schema_id] = s.[schema_id]
INNER JOIN sys.identity_columns AS ic
ON t.[object_id] = ic.[object_id]
INNER JOIN sys.partitions AS p
ON p.[object_id] = t.[object_id]
WHERE p.[rows] = 0 -- only empty tables
AND p.index_id IN (0,1)
AND p.partition_number = 1;

PRINT @sql;
-- EXEC sys.sp_executesql @sql;