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May be you should shown the both table structures or at least the relevant portion of the structures, without which it becomes difficult to help.<br />
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Is there a primary key (not likely) or a unique key defined on column cstaddress_id on table customer?<br />
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Is the datatype of column cstaddress_id in both the tables is identical?<br />
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Please review and revert. Share more details if error continues...
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May be you should shown the both table structures or at least the relevant portion of the structures, without which it becomes difficult to help.

Is there a primary key (not likely) or a unique key defined on column cstaddress_id on table customer?

Is the datatype of column cstaddress_id in both the tables is identical?

Please review and revert. Share more details if error continues...

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Besides providing us with the table schemas, you should also provide us the command that you're trying to run to create the FK.
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Besides providing us with the table schemas, you should also provide us the command that you're trying to run to create the FK.

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If I try to add a Foreign key column in existing other tables then A &nbsp;error is burned.<br />
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Msg 1769, Level 16, State 1, Line 62<br />
Foreign key 'Cstaddress_id' references invalid column 'Cstaddress_id' in referencing table 'customer'.<br />
Msg 1750, Level 16, State 0, Line 62<br />
Could not create constraint or index. See previous errors.<br />
<br />
So please give me the solution of this error.
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If I try to add a Foreign key column in existing other tables then A  error is burned.

Msg 1769, Level 16, State 1, Line 62
Foreign key 'Cstaddress_id' references invalid column 'Cstaddress_id' in referencing table 'customer'.
Msg 1750, Level 16, State 0, Line 62
Could not create constraint or index. See previous errors.

So please give me the solution of this error.

My question from foreign key ?

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.