An error is encountered when the primary key table is updated but it is referenced by a foreign key table. The error indicates that the update statement conflicted with the foreign Key constraint. So how can we get overcome of this error? The steps are as the following as in SQL statements.

STEP 1:
USE [YourDatabase]
GO

STEP 2:
ALTER TABLE [dbo].[YourForeignKeyTable]  DROP CONSTRAINT [FK_YourForeignKeyTable_YourPrimaryKeyTable]
GO

STEP 3:
DROP TABLE [dbo].[YourPrimaryKeyTable]
GO

STEP 4:
CREATE TABLE [dbo].[YourPrimaryKeyTable](
	[YourPrimaryKeyTableId] [uniqueidentifier] NOT NULL,
	[YourPrimaryKeyTableName] [nvarchar](100) NULL,	
 CONSTRAINT [PK_YourPrimaryKeyTable] PRIMARY KEY CLUSTERED 
(
	[YourPrimaryKeyTableId] ASC
)
) ON [PRIMARY]
GO

STEP 5:
INSERT [dbo].[YourPrimaryKeyTable] ([YourPrimaryKeyTableId], [YourPrimaryKeyTableName]) VALUES (N'c7954f89-b5f0-47b7-962f-0c5b2800cff2', N'Civil')
GO
INSERT [dbo].[YourPrimaryKeyTable] ([YourPrimaryKeyTableId], [YourPrimaryKeyTableName]) VALUES (N'c7954f89-b5f0-47b7-962f-0c5b2800cff3', N'Mechanical')
GO

STEP 6:
ALTER TABLE [dbo].[YourForeignKeyTable]  WITH CHECK ADD  CONSTRAINT [FK_YourForeignKeyTable_YourPrimaryKeyTable]
FOREIGN KEY([YourForeignKeyTableId]) REFERENCES [dbo].[YourPrimaryKeyTable] ([YourPrimaryKeyTableId])
GO

 And now you are done.