Read SMS and Send Automatic Reply through GSM modem

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VB

Please help, I am currently developing a system for our school grading system, the students can inquire there grades using Cellular phone by sending a specific keyword (Example: grade semester sy idnumber). I will be using this keyword to create sql statement to look the grades of the student in mysql database and once the grades found it will send automatically to student's cellular phone, anybody can help me how to accomplish this task? I need to create a program in C# or VB.net that will automatically read the incoming message and create queries to look student's grades in mysql database and once found send the grades automatically to the student's cellular phone. Please help.