C# Signature:
[DllImport("user32.dll")]
static extern bool IsCharLower(char ch);
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace IsCharLower
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
[DllImport("user32.dll")]
static extern bool IsCharLower(char ch);
private void button1_Click(object sender, EventArgs e)
{
try
{
char ch = Convert.ToChar(textBox1.Text);
if (IsCharLower(ch))
{
label1.Text = " Lowercase characters are entered and Compiler 1 is returned.";
label2.Text = " Character Entered Is = " + ch.ToString();
}
else
{
label1.Text = "Entered in uppercase characters or numbers or symbols and compiler 0 is returned.";
label2.Text = " Character Entered Is = " + ch.ToString();
}
textBox1.Clear();
}
catch
{
MessageBox.Show(
"Please enter a character.",
" ", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
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Sample Code:
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Alternative Managed API:
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