Implement Ctrl+A for selection all text.

Samples/SVGViewer/SvgViewer.Designer.cs

@@ -84,6 +84,7 @@
             this.textBox1.Size = new System.Drawing.Size(307, 446);
             this.textBox1.TabIndex = 2;
             this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
+            this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);
             // 
             // SVGViewer
             // 

Samples/SVGViewer/SvgViewer.cs

@@ -50,6 +50,20 @@ namespace SVGViewer
             }
         }
 
+        private void textBox1_KeyDown(object sender, KeyEventArgs e)
+        {
+            try
+            {
+                if (e.Control && e.KeyCode == Keys.A)
+                {
+                    (sender as TextBox).SelectAll();
+                }
+            }
+            catch
+            {
+            }
+        }
+
         private void RenderSvg(SvgDocument svgDoc)
         {
             //var render = new DebugRenderer();