How to dynamically define the font color of a textbox in WinForms?

In WinForm, you can dynamically define the font color of a TextBox by setting the ForeColor property.

You can use the following code to dynamically define the font color of a TextBox:

textBox1.ForeColor = Color.Red; // 设置字体颜色为红色

Furthermore, the font color can be dynamically changed based on specific conditions. For example, when the text length of the TextBox exceeds a certain limit, the font color is changed to red.

if (textBox1.Text.Length > 10)
{
    textBox1.ForeColor = Color.Red;
}

In this way, when the text length of TextBox exceeds 10, the font color will change to red.