Simple common ASP. NET code (1) (1)

The following is a summary of the 33 common ASP. NET codes that help beginners learn more about ASP. NET.

ASP. NET Common Code 1. open a new window and send parameters:

Transfer Parameters:

 
 

  
  
response.write("＜script＞window.open(’*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"’)＜/script＞")   
 
 

Receiving parameters:

 
 

  
  
string a = Request.QueryString("id");   
  
  
string b = Request.QueryString("id1");   
 
 

Common ASP. NET code 2. Button Addition Dialog Box

 
 

  
  
Button1.Attributes. Add ("Onclick","Return confirm ('OK? ')");
  
  
Button. attributes. add ("Onclick","If (confirm ('are you sure ...? ') {Return true;} else {return false ;}")
  
  
 
 
 

ASP. NET Common Code 3. Delete selected table records

 
 

  
  
int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];   
  
  
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()   
 
 

ASP. NET Common Code 4. Delete table record warning

 
 

  
  
Private VoidDataGrid_ItemCreated (Object sender, DataGridItemEventArgs e)
  
  
{
  
  
　Switch(E. Item. ItemType)
  
  
{
  
  
CaseListItemType. Item:
  
  
CaseListItemType. AlternatingItem:
  
  
CaseListItemType. EditItem:
  
  
TableCell myTableCell;
  
  
MyTableCell = e. Item. Cells [14];
  
  
LinkButton myDeleteButton;
  
  
MyDeleteButton = (LinkButton) myTableCell. Controls [0];
  
  
MyDeleteButton. Attributes. Add ("Onclick","Return confirm ('Are you sure you want to delete this information ');");
  
  
　Break;
  
  
Default:
  
  
　Break;
  
  
}
  
  
 
  
  
}
  
  
 
 
 

ASP. NET Common Code 5. Click the table row link to another page

 
 

  
  
Private VoidGrdCustomer_ItemDataBound (ObjectSender, System. Web. UI. WebControls. DataGridItemEventArgs e)
  
  
{
  
  
　// Click Open Table 
  
  
　If(E. Item. ItemType = ListItemType. Item | e. Item. ItemType = ListItemType. AlternatingItem)
  
  
E. Item. Attributes. Add ("Onclick","Window. open ('default. aspx? Id ="+ E. Item. Cells [0]. Text +"');");
  
  
}
  
  
 
  
  
Double-click a table to connect to another page
  
  
 
  
  
In the itemDataBind event
  
  
 
  
  
If(E. Item. ItemType = ListItemType. Item | e. Item. ItemType = ListItemType. AlternatingItem)
  
  
{
  
  
　StringOrderItemID = e. item. cells [1]. Text;
  
  
...
  
  
E. item. Attributes. Add ("Ondblclick","Location. href = '../ShippedGrid. aspx? Id ="+ OrderItemID +"'");
  
  
}
  
  
 
  
  
Double-click a table to open a new page.
  
  
 
  
  
If(E. Item. ItemType = ListItemType. Item | e. Item. ItemType = ListItemType. AlternatingItem)
  
  
{
  
  
　StringOrderItemID = e. item. cells [1]. Text;
  
  
...
  
  
E. item. Attributes. Add ("Ondblclick","Open ('../ShippedGrid. aspx? Id ="+ OrderItemID +"')");
  
  
}
  
  
 
 
 

★Note :? Id =] cannot be? Id =]

Common ASP. NET Code 6. Passing parameters in Table hyperjoin Columns

 
 

  
  
<Asp: HyperLinkColumn Target ="_ Blank"Headertext ="ID"DataTextField ="Id"NavigateUrl = "aaa. aspx? Id ='
  
  
<% # DataBinder. Eval (Container. DataItem,"Data field 1") %> '& Name =' <% # DataBinder. Eval (Container. DataItem,"Data field 2") %> '/>
  
  
 
 
 

Common ASP. NET code 7. Change the color of a table by clicking

 
 

  
  
if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem)   
  
  
{   
  
  
　e.Item.Attributes.Add("onclick","this.style.backgroundColor=’#99cc00’;   
  
  
　 this.style.color=’buttontext’;this.style.cursor=’default’;");   
  
  
}     
  
  
 
 
 

Written in _ ItemDataBound of the DataGrid

 
 

  
  
if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem)   
  
  
{   
  
  
e.Item.Attributes.Add("onmouseover","this.style.backgroundColor=’#99cc00’;   
  
  
　this.style.color=’buttontext’;this.style.cursor=’default’;");   
  
  
e.Item.Attributes.Add("onmouseout","this.style.backgroundColor=’’;this.style.color=’’;");   
  
  
}    
  
  
 
 
 

Common ASP. NET code 8. Date Format

Date Format setting:

 
 

  
  
DataFormatString="{0:yyyy-MM-dd}"    
  
  
 
 
 

I think it should be in the itembound event

 
 

  
  
E. items. cell ["Your column"]. Text = DateTime. Parse (e. items. cell ["Your column"]. Text. ToString ("Yyyy-MM-dd"))
 
 

ASP. NET Common Code 9. Get error information and go to the specified page

Instead of using Response. Redirect, you should use Server. Transfer

E. g

 
 

  
  
// In global. asax 
  
  
Protected VoidApplication_Error (Object sender, EventArgs e ){
  
  
If(Server. GetLastError ()IsHttpUnhandledException)
  
  
Server. Transfer ("MyErrorPage. aspx");
  
  
 
  
  
// The remaining non-HttpUnhandledException exceptions are handled by asp.net itself and okay will be handled :) 
  
  
}
 
 

Redirect will lead to post-back loss of error information, so the page orientation should be executed directly on the server side, so that the error information can be obtained on the error handling page and processed accordingly

10. Clearing cookies in common ASP. NET Codes

 
 

  
  
Cookie.Expires=[DateTime];   
  
  
Response.Cookies("UserName").Expires = 0