Grey out inapplicable input boxes in the reprint dialog.

BulkPrinting/BulkPrinting/ReprintForm.Designer.cs

             this.rdoRange.TabStop = true;
             this.rdoRange.Text = "Choose a range from this batch:";
             this.rdoRange.UseVisualStyleBackColor = true;
+            this.rdoRange.CheckedChanged += new System.EventHandler(this.rdoRange_CheckedChanged);
             // 
             // rdoSerial
             // 
             this.rdoSerial.TabIndex = 2;
             this.rdoSerial.Text = "Choose an individual voucher by serial number:";
             this.rdoSerial.UseVisualStyleBackColor = true;
+            this.rdoSerial.CheckedChanged += new System.EventHandler(this.rdoSerial_CheckedChanged);
             // 
             // label9
             // 
             this.rdoPageRange.TabStop = true;
             this.rdoPageRange.Text = "Choose a page range from the above batch:";
             this.rdoPageRange.UseVisualStyleBackColor = true;
+            this.rdoPageRange.CheckedChanged += new System.EventHandler(this.rdoPageRange_CheckedChanged);
             // 
             // numFirstPageNum
             // 

BulkPrinting/BulkPrinting/ReprintForm.cs

 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Forms;
 using System.Data.SQLite;
+using System.Windows.Forms;
 
 namespace BulkPrinting
 {
 
         private void ReprintForm_Load(object sender, EventArgs e)
         {
+            RadioButtonChanged();
+
             CanReprintThisSession =
                 ((Globals.SessionMode == SessionModes.Online &&
                     Utility.CheckUserAccess(Utility.UserPermissions.CanReprintOnline)) ||
         {
 
         }
+
+        private void RadioButtonChanged()
+        {
+            numFirstSeqNum.Enabled = rdoRange.Checked;
+            numLastSeqNum.Enabled = rdoRange.Checked;
+
+            numFirstPageNum.Enabled = rdoPageRange.Checked;
+            numLastPageNum.Enabled = rdoPageRange.Checked;
+
+            txtSerialNum.Enabled = rdoSerial.Checked;
+        }
+
+        private void rdoRange_CheckedChanged(object sender, EventArgs e)
+        {
+            RadioButtonChanged();
+        }
+
+        private void rdoPageRange_CheckedChanged(object sender, EventArgs e)
+        {
+            RadioButtonChanged();
+        }
+
+        private void rdoSerial_CheckedChanged(object sender, EventArgs e)
+        {
+            RadioButtonChanged();
+        }
     }
 }