Create Custom Policy File for SharePoint WebPart

Now you can run your code without modify FULL trust in WEB.Config file.
Below Steps to create Custom Policy File for WebPart.

• Copy WSS_Minimal.config fole from ...\12\Config\ folder.
• Rename to MyCustom_minimal.config.
• Now Add below Code to this config file as per given location.

Add below code

Code Start Here Code End Here

• Now Create Your PublicKey's Blob file as per below.
• Open VS's command Promt and RUN below Command

sn -p YourStongNameFile.snk PublicKeyOnly.snk

YourStrongNameFile.snk = Your Projects SNK
PublicKeyOnly.snk = New creted PublicKey

Now Create Blob as below command.

sn -tp PublicKeyOnly.snk

Now your PublicKey's BLOB created like below (here Example)

Copy New Blob and past in above config file.

• Put your config file in ...\12\Config\ folder.
• Add one tag in config file below WSS_Medium,WSS_Minimal trust level like below.
  
  Also change Trust Level WSS_Minimal to MyCustom_Minimal.