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<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="+" onclick="Button1_Click"></asp:Button>
<asp:Button ID="Button2" runat="server" Text="-" onclick="Button1_Click"></asp:Button>
<asp:Button ID="Button3" runat="server" Text="*" onclick="Button1_Click"></asp:Button>
<asp:Button ID="Button4" runat="server" Text="/" onclick="Button1_Click"></asp:Button>
protected void Button1_Click(object sender, EventArgs e)
{
string type = (sender as Button).Text;
float num1 = float.Parse(TextBox1.Text);
float num2 = float.Parse(TextBox2.Text);
float rst = 0;
switch (type)
{
case "+": rst = num1 + num2; break;
case "-": rst = num1 - num2; break;
case "*": rst = num1 * num2; break;
case "/": rst = num1 / num2; break;
}
TextBox3.Text = rst.ToString();
}