Initial population

JRCookbookControls/JRCookbookAutoVerticalGrowTextBox.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using System.ComponentModel;
+
+namespace JRCookbookControls
+{
+    [System.Serializable()]
+    public class JRCookbookAutoVerticalGrowTextBox : TextBox
+    {
+        private int _MinCharactersToMultiLine = 0;
+
+        public JRCookbookAutoVerticalGrowTextBox()
+        {
+            this.Multiline = (this.Text.Length >= _MinCharactersToMultiLine);
+
+            this.TextChanged += JRCookbookAutoVerticalGrowTextBox_TextChanged;
+            this.MultilineChanged += JRCookbookAutoVerticalGrowTextBox_MultilineChanged;
+            this.Resize += JRCookbookAutoVerticalGrowTextBox_Resize;
+
+        }
+
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
+        public int MinCharactersToMultiLine
+        {
+            get
+            {
+                return _MinCharactersToMultiLine;
+            }
+            set
+            {
+                _MinCharactersToMultiLine = value;
+                this.Multiline = (this.Text.Length >= _MinCharactersToMultiLine);
+            }
+        }
+
+
+
+
+        private void JRCookbookAutoVerticalGrowTextBox_Resize(object sender, EventArgs e)
+        {
+            RecalculateTextBoxHeight();
+        }
+
+        private void JRCookbookAutoVerticalGrowTextBox_TextChanged(System.Object sender, System.EventArgs e)
+        {
+            this.Multiline = (this.Text.Length >= _MinCharactersToMultiLine);
+            RecalculateTextBoxHeight();
+        }
+
+        private void JRCookbookAutoVerticalGrowTextBox_MultilineChanged(System.Object sender, System.EventArgs e)
+        {
+            //while we can't hide the multiline property, we can at least enforce its value.
+            this.Multiline = (this.Text.Length >= _MinCharactersToMultiLine);
+        }
+
+        private void RecalculateTextBoxHeight()
+        {
+            // amount of padding to add
+            const int padding = 3;
+            // get number of lines (first line is 0, so add 1)
+            int numLines = this.GetLineFromCharIndex(this.TextLength) + 1;
+            // get border thickness
+            int border = this.Height - this.ClientSize.Height;
+            // set height (height of one line * number of lines + spacing)
+            this.Height = this.Font.Height * numLines + padding + border;
+        }
+
+    }
+}