Windows 7: How to Extend the volume of a HDD Partition

I have three Partitions for my 250 GB HDD, which name Respectively as C, E, F. just I want to increase the size of “C” partition. I shrink 20 GB space from the “F “Partition. I want to merge this space and C HDD Partition.
Can this is possible.

It is possible. Please post a full picture of your Disk Management so that we can discuss the options.

@whs , thanks for your reply.

This is going to be a bit finagle but it can be done. Download the bootable CD iso of Partition Wizard (last entry on the webpage). Burn that iso to CD and boot your system with the CD.

Then have a look at Option3 of this tutorial. You need to shrink F on the left side and add those e.g. 20GB to E. Then you shrink E on the left side and add it to C.

This is the easiest method. With Disk Management it would be more complicated.