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double inp;
if(double.TryParse(TextBox1.Text,out inp))
{
if(inp>=0)
Label1.Text=Math.Sqrt(inp).ToString();
else
Lagel1.Text="负数开方");
}
else
{
Lagel1.Text="格式错误");
}
private void button1_Click(object sender, EventArgs e)
{
label1.Text = Math.Sqrt(Convert.Double(textBox1.Text)).ToString();
}