C # Beginlnvoke Delegate

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Using system.linq;using system.text;using system.windows.forms;namespace windowsformsapplication1{public partial        Class Form1:form {public delegate void Deletask (int num1, int num2);        Public Form1 () {InitializeComponent ();            } private void Button1_Click (object sender, EventArgs e) {deletask task = new Deletask (test); int num30 = Int.            Parse (This.textBox1.Text); int num40 = Int.            Parse (This.textBox2.Text); Task.        BeginInvoke (NUM30, NUM40, NULL, NULL);            } private void Test (int num1, int num2) {int sum = 0;                for (int i = NUM1; I <= num2; i++) {sum + = NUM1;            num1++; } this.label1.Text = Sum.        ToString ();     private void Form1_Load (object sender, EventArgs e)   {control.checkforillegalcrossthreadcalls = false; }    }}

C # Delegate thread return value using system;using system.collections.generic;using system.componentmodel;using system.data;using    System.drawing;using system.linq;using system.text;using system.windows.forms;namespace WindowsFormsApplication1{        Public partial class Form1:form {public delegate int deletask (int num1, int num2);        Public Form1 () {InitializeComponent ();            } private void Button1_Click (object sender, EventArgs e) {deletask task = test; int num3 = Int.            Parse (This.textBox1.Text); int num4 = Int.            Parse (This.textBox2.Text); Task.            BeginInvoke (num3, num4, NULL, NULL); IAsyncResult res = task.            BeginInvoke (num3, num4, NULL, NULL); int result = task.            EndInvoke (RES); This.label1.Text = result.        ToString ();            } private int Test (int num1, int num2) {int sum = 0; for (int i = NUM1; I <= num2; i++) {sum + = nUM1;            num1++;        } return sum;  private void Form1_Load (object sender, EventArgs e) {control.checkforillegalcrossthreadcalls =        False }    }}

　　

C # Beginlnvoke Delegate