How to Create a C# Calculator in 25 minutes using the Switch statement to select one of many code block to be executed. An excellent tutorial for beginner and advanced learner.

______________________Note: Missing Dot Codes_____________________
if (btnDec.Text == ".")
{
if (!txtDisplay.Text.Contains("."))
{
txtDisplay.Text = txtDisplay.Text + btnDec.Text;
}

}
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