diff --git "a/33\347\211\233\346\226\207\350\275\251/ASP.NET\344\275\234\344\270\232/WebForm1.aspx.cs" "b/33\347\211\233\346\226\207\350\275\251/ASP.NET\344\275\234\344\270\232/WebForm1.aspx.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..1ef81dc2e07afe8011088d6d38eeeaf230723ee3
--- /dev/null
+++ "b/33\347\211\233\346\226\207\350\275\251/ASP.NET\344\275\234\344\270\232/WebForm1.aspx.cs"
@@ -0,0 +1,58 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+
+namespace WebApplication1
+{
+    public partial class WebForm1 : System.Web.UI.Page
+    {
+        protected void Page_Load(object sender, EventArgs e)
+        {
+
+        }
+
+        protected void Button1_Click(object sender, EventArgs e)
+        {
+            double a = double.Parse(TextBox1.Text);
+            double b = double.Parse(TextBox2.Text);
+            double aa = a + b;
+            Label1.Text = aa.ToString();
+        }
+
+        protected void Button2_Click(object sender, EventArgs e)
+        {
+            double a = double.Parse(TextBox1.Text);
+            double b = double.Parse(TextBox2.Text);
+            double aa = a - b;
+            Label1.Text = aa.ToString();
+        }
+
+        protected void Button3_Click(object sender, EventArgs e)
+        {
+            double a = double.Parse(TextBox1.Text);
+            double b = double.Parse(TextBox2.Text);
+            double aa = a * b;
+            Label1.Text = aa.ToString();
+        }
+
+        protected void Button4_Click(object sender, EventArgs e)
+        {
+            double a = double.Parse(TextBox1.Text);
+            double b = double.Parse(TextBox2.Text);
+            double aa = 0;
+            if (b == 0)
+            {
+                Label1.Text = "除数不能为0";
+                return;
+            }
+            else {
+
+                aa = a / b;
+            }
+            Label1.Text = aa.ToString();
+        }
+    }
+}
\ No newline at end of file
diff --git "a/33\347\211\233\346\226\207\350\275\251/\344\275\234\344\270\232/WebForm1.aspx.cs" "b/33\347\211\233\346\226\207\350\275\251/\344\275\234\344\270\232/WebForm1.aspx.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..33e36a8d5633c33f6b008d54b13e63267f54f846
--- /dev/null
+++ "b/33\347\211\233\346\226\207\350\275\251/\344\275\234\344\270\232/WebForm1.aspx.cs"
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+
+namespace WebApplication1
+{
+    public partial class WebForm1 : System.Web.UI.Page
+    {
+        protected void Page_Load(object sender, EventArgs e)
+        {
+            if (!Page.IsPostBack) {
+                SqlDataSource1.SelectCommand = "select * from city where type=1 ";
+
+                SqlDataSource2.SelectCommand = "select * from city where type=2 and pid=2";
+                SqlDataSource3.SelectCommand = "select * from city where type=3 and pid in (select id from city where type = 2 and pid = 2)";
+            }
+
+        }
+
+        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            SqlDataSource2.SelectCommand = "select * from city where type=2 and pid=" + DropDownList1.SelectedValue;
+            SqlDataSource3.SelectCommand = "select * from city where type=3 and pid in (select id from city where type = 2 and pid = " + DropDownList1.SelectedValue+")";
+        }
+
+        protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            SqlDataSource3.SelectCommand = "select * from city where type=3 and pid =" + DropDownList2.SelectedValue;
+        }
+
+        protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
+        {
+
+        }
+    }
+}
\ No newline at end of file