//1.添加项
checkedListBox1.Items.Add("蓝色"); 
checkedListBox1.Items.Add("红色"); 
checkedListBox1.Items.Add("黄色");



//2.判断第i项是否选中,选中为true,否则为false
if（checkedListBox1.GetItemChecked(i)）
{
     return true;
} 
else
{
     return false; 
}



//3.设置第i项是否选中
checkedListBox1.SetItemChecked(i, true); //true改为false为没有选中。



//4.设置全选 
//添加一个名为select_all的checkbox控件，由其控制checkedListBox是全选还是全不选。
private void select_all_CheckedChanged(object sender, EventArgs e) 
{ 
     if(select_all.Checked) 
{
          for (int j = 0; j < checkedListBox1.Items.Count; j++) 
               checkedListBox1.SetItemChecked(j, true); 
}
else 
{
for (int j =0; j < checkedListBox1.Items.Count; j++) 
      checkedListBox1.SetItemChecked(j, false);
}
}



//5.得到全部选中的值 ，并将选中的项的文本组合成为一个字符串。
string strCollected = string.Empty;
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
      if (checkedListBox1.GetItemChecked(i))
      {
          if (strCollected == string.Empty)
          {
               strCollected = checkedListBox1.GetItemText(
checkedListBox1.Items[i]);
          }
          else
          {
               strCollected = strCollected + "/" + checkedListBox1.
GetItemText(checkedListBox1.Items[i]);
           }
       }
}




//6.设置CheckedListBox中第i项的Checked状态
checkedListBox1.SetItemCheckState(i, CheckState.Checked);




//7.private void checkBoxAll_CheckedChanged(object sender, EventArgs e) 
{ 
     if (checkBoxAll.Checked) 
     { 
         //被选择了则将CheckedListBox中的所有条目都变为Checked状态 
         for (int i = 0; i < checkedListBoxLayerControl.Items.Count;
                   i++) 
         {     
checkedListBoxLayerControl.SetItemCheckState(i, 
        CheckState.Checked); 
} 
}
else 
{ 
     //否则变成Unchecked状态 
    for (int i = 0;
i < checkedListBoxLayerControl.Items.Count; i++) 
{
checkedListBoxLayerControl.SetItemCheckState(i, CheckState.Unchecked); 
}              
}
}



//8.checkedListBox 单选设置(代码实现)
private void chkl_ItemAuditing_ItemCheck(object sender,   
ItemCheckEventArgs e)
{ 
     if (chkl_ItemAuditing.CheckedItems.Count > 0) 
    { 
         for (int i = 0; i < chkl_ItemAuditing.Items.Count; i++) 
         {
if (i != e.Index) 
{ 
this.chkl_ItemAuditing.SetItemCheckState(i, 
System.Windows.Forms.CheckState.Unchecked); 
} 
} 
} 
}



//9.checkedListBox1显示一个数据库中关键字对应的所有记录
for (int i = 0; i < table.Rows.Count; i++) 
{ 
    string name = table.Rows["myname"].ToString(); 
    string paw = table.Rows["mypaw"].ToString(); 
    checkedListBox1.Items.Add(name + paw); 
}



//10.for(i=0;i<CheckedListBox.Items.Count;i++)   
{   
   if(CheckedListBox.GetItemText(
CheckedListBox.Items)=="你得到的值")   
{   
      CheckedListBox.SetItemChecked(i,true);   
}   
}



//11.清除checkedListBox1中所有的选项
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
    checkedListBox1.Items.Clear();
}


//12.设置索引为index的项为选中状态
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{
    checkedListBox1.SetItemChecked(i, true);
} 



//13.for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{
if (checkedListBox1.GetSelected(i)) 
{
MessageBox.Show(checkedListBox1.CheckedItems.ToString());
}
}



//14.选中checkedListBox1所有的选项

for (int i = 0; i < checkedListBox1.Items.Count; i++)         
{
checkedListBox1.SetItemCheckState(i, CheckState.Checked);
}



//15.          
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{ 
//如果checkedListBox1的第i项被选中，
//则显示checkedListBox1对应的值
if (checkedListBox1.GetItemChecked(i)) 
{ 
     MessageBox.Show(checkedListBox1.Items.ToString()); 
}
}



//16.反向选择checkedListBox1的选项
for (int i = 0; i < checkedListBox1.Items.Count; i++) 
{ 
    if (checkedListBox1.GetItemChecked(i)) 
   { 
       checkedListBox1.SetItemChecked(i, false); 
   } 
   else 
   { 
       checkedListBox1.SetItemChecked(i, true); 
   } 
}



//17.checkedListBox1中选定的项->checkedListBox2
for (int i = 0; i < checkedListBox1.CheckedItems.Count; i++) 
{ 
     checkedListBox2.Items.Add(this.checkedListBox1.CheckedItems);

//remove是除去一个具体的值，不是index，注意了
     this.checkedListBox1.Items.Remove(
         this.checkedListBox1.CheckedItems);       
}