Update sql Statement based on a GridView field

Hello,
I am trying run an update statement based on a current GridView.  The reason is that if the sql table data is updated while in the current GridView, I only want to set an update for each record of the currently selected data.
Insert Statement:

using (SqlCommand command = new SqlCommand())
                        {command.Connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);
command.CommandText = @"insert into [Comm](CommType, StudentID)
                                                    values(@CommType, @StudentID)";
command.Parameters.Add("@CommType", SqlDbType.VarChar, 16).Value = "Emailed";
command.Parameters.Add("@StudentID", SqlDbType.VarChar, 9).Value = **How do I add a GridView Column Name here for each record in my GridView?***;                           
                            command.Connection.Open();
                            command.ExecuteNonQuery();
                            command.Parameters.Clear();
                            command.Connection.Close();

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Comm Table:

	[ID] [int] IDENTITY(1,1) NOT NULL,
	[CommType] [varchar](16) NULL,
	[StudentID] [varchar](9) NULL,

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The field I want to grab from the GridView is:
asp:BoundField DataField="StudentID"

Is is possible to do this, or is there a better way to achieve this?

Thank you for any assistance.