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I have a maskedtextbox. I am trying to convert the contents to DateTime but when I do it says it is not a valid string. I have checked the value at runtime and it is returning the mask in the string. I did a little research and found the TextMaskFormat property. I have set this to ExcludePromptsandLiterals but it is still returning the mask in the value. Any idea why?

Thanks.

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Last Post by sknake
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Form1.cs :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace maskedtextbox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DateTime dt = Convert.ToDateTime(maskedTextBox1.Text);
            MessageBox.Show(dt.ToShortDateString());
        }
    }
}

Form1.Designer.cs :

namespace maskedtextbox
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.maskedTextBox1 = new System.Windows.Forms.MaskedTextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // maskedTextBox1
            // 
            this.maskedTextBox1.Location = new System.Drawing.Point(65, 35);
            this.maskedTextBox1.Mask = "00/00/0000";
            this.maskedTextBox1.Name = "maskedTextBox1";
            this.maskedTextBox1.Size = new System.Drawing.Size(100, 20);
            this.maskedTextBox1.TabIndex = 0;
            this.maskedTextBox1.ValidatingType = typeof(System.DateTime);
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(54, 81);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(121, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "show the input";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 264);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.maskedTextBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.MaskedTextBox maskedTextBox1;
        private System.Windows.Forms.Button button1;
    }
}

The working project is attached to this post. You can run it with visual studio 2008 express edition or full edition.

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What mask do you have defined in your masked text box? You should be able to parse the string and assemble your DateTime in a worst-case scenario. It sounds like this is a weird mask...

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