[Solved] Automatically check textbox length c# [closed]

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You are looking for the TextChanged event.

Write the method:

protected void textBox1_TextChanged(object sender, EventArgs e)
{
    if(textBox1.Text.Length >= 8)
    {
        // do things
    }
}

Then add it as a listener:

textBox1.TextChanged += this.TextBox1_TextChanged;

(If you’re using the Visual Studio designer you can select the TextBox, go to the Properties window, click the Events button, and double click the TextChanged event to automatically create and add the method)

solved Automatically check textbox length c# [closed]