Datagridview instance 2

Using system;
Using system. Windows. forms;

Public class form1: Form
{
Private datagridview maid = new datagridview ();

// Declare an arraylist to serve as the data store.
Private system. Collections. arraylist MERs =
New system. Collections. arraylist ();

// Declare a customer object to store data for a row being edited.
Private customer customerinedit;

// Declare a variable to store the index of a row being edited.
// A value of-1 indicates that there is no row currently in edit.
Private int rowinedit =-1;

// Declare a variable to indicate the commit scope.
// Set this value to false to use cell-level commit scope.
Private bool rowscopecommit = true;

[Stathreadattribute ()]
Public static void main ()
{
Application. Run (New form1 ());
}

Public form1 ()
{
// Initialize the form.
This. Maid = dockstyle. Fill;
This. Controls. Add (this. datagridview1 );
This. Load + = new eventhandler (form1_load );
This. Text = "datagridview virtual-mode demo (Row-level commit scope )";
}

Private void form1_load (Object sender, eventargs E)
{
// Enable virtual mode.
This. datagridview1.virtualmode = true;

// Connect the virtual-mode events to event handlers.
This. Maid + = new
Datagridviewcellvalueeventhandler (maid );
This. Maid + = new
Datagridviewcellvalueeventhandler (maid );
This. Maid + = new
Datagridviewroweventhandler (maid newrowneeded );
This. Maid + = new
Datagridviewcelleventhandler (maid rowvalidated );
This. Maid + = new
Questioneventhandler (maid rowdirtystateneeded );
This. Maid + = new
Questioneventhandler (maid cancelrowedit );
This. Maid + = new
Maid (maid userdeletingrow );

// Add columns to the datagridview.
Datagridviewtextboxcolumn companynamecolumn = new
Datagridviewtextboxcolumn ();
Companynamecolumn. headertext = "company name ";
Companynamecolumn. Name = "company name ";
Datagridviewtextboxcolumn contactnamecolumn = new
Datagridviewtextboxcolumn ();
Contactnamecolumn. headertext = "contact name ";
Contactnamecolumn. Name = "contact name ";
This. Maid. Add (companynamecolumn );
This. Maid. Add (contactnamecolumn );
This. Maid =
Datagridviewautosizecolumnsmode. allcells;

// Add some sample entries to the Data Store.
This. Customers. Add (new customer (
"Bon app'", "Laurence lebihan "));
This. Customers. Add (new customer (
"Bottom-dollar markets", "Elizabeth Lincoln "));
This. Customers. Add (new customer (
"B's beverages", "Victoria Ashworth "));

// Set the row count, including the row for new records.
This. Maid = 4;
}

Private void maid (Object sender,
System. Windows. Forms. datagridviewcellvalueeventargs E)
{
// If this is the row for new records, no values are needed.
If (E. rowindex = This. datagridview1.rowcount-1) return;

Customer customertmp = NULL;

// Store a reference to the customer object for the row being painted.
If (E. rowindex = rowinedit)
{
Customertmp = This. customerinedit;
}
Else
{
Customertmp = (customer) This. MERs [E. rowindex];
}

// Set the cell value to paint using the customer object retrieved.
Switch (this. datagridview1.columns [E. columnindex]. Name)
{
Case "company name ":
E. value = customertmp. companyName;
Break;

Case "contact name ":
E. value = customertmp. contactname;
Break;
}
}

Private void maid (Object sender,
System. Windows. Forms. datagridviewcellvalueeventargs E)
{
Customer customertmp = NULL;

// Store a reference to the customer object for the row being edited.
If (E. rowindex <this. MERs. Count)
{
// If the user is editing a new row, create a new customer object.
If (this. customerinedit = NULL)
{
This. customerinedit = new customer (
(Customer) This. MERs [E. rowindex]). companyName,
(Customer) This. MERs [E. rowindex]). contactname );
}
Customertmp = This. customerinedit;
This. rowinedit = E. rowindex;
}
Else
{
Customertmp = This. customerinedit;
}

// Set the appropriate customer property to the cell value entered.
String newvalue = E. value as string;
Switch (this. datagridview1.columns [E. columnindex]. Name)
{
Case "company name ":
Customertmp. companyName = newvalue;
Break;

Case "contact name ":
Customertmp. contactname = newvalue;
Break;
}
}

Private void maid (Object sender,
System. Windows. Forms. datagridviewroweventargs E)
{
// Create a new customer object when the user edits
// The row for new records.
This. customerinedit = new customer ();
This. rowinedit = This. Maid. Rows. Count-1;
}

Private void maid (Object sender,
System. Windows. Forms. datagridviewcelleventargs E)
{
// Save row changes if any were made and release the edited
// Customer object if there is one.
If (E. rowindex> = This. MERs. Count &&
E. rowindex! = This. Maid. Count-1)
{
// Add the new customer object to the Data Store.
This. Customers. Add (this. customerinedit );
This. customerinedit = NULL;
This. rowinedit =-1;
}
Else if (this. customerinedit! = NULL &&
E. rowindex <this. MERs. Count)
{
// Save the modified customer object in the Data Store.
This. Customers [E. rowindex] = This. customerinedit;
This. customerinedit = NULL;
This. rowinedit =-1;
}
Else if (this. datagridview1.containsfocus)
{
This. customerinedit = NULL;
This. rowinedit =-1;
}
}

Private void maid (Object sender,
System. Windows. Forms. questioneventargs E)
{
If (! Rowscopecommit)
{
// In cell-level commit scope, indicate whether the value
// Of the current cell has been modified.
E. Response = This. datagridview1.iscurrentcelldirty;
}
}

Private void maid (Object sender,
System. Windows. Forms. questioneventargs E)
{
If (this. rowinedit = This. datagridview1.rows. Count-2 &&
This. rowinedit = This. MERs. Count)
{
// If the user has canceled the edit of a newly created row,
// Replace the corresponding customer object with a new, empty one.
This. customerinedit = new customer ();
}
Else
{
// If the user has canceled the edit of an existing row,
// Release the corresponding customer object.
This. customerinedit = NULL;
This. rowinedit =-1;
}
}

Private void maid userdeletingrow (Object sender,
System. Windows. Forms. datagridviewrowcanceleventargs E)
{
If (E. Row. index <this. MERs. Count)
{
// If the user has deleted an existing row, remove
// Corresponding customer object from the data store.
This. Customers. removeat (E. Row. Index );
}

If (E. Row. Index = This. rowinedit)
{
// If the user has deleted a newly created row, release
// The corresponding customer object.
This. rowinedit =-1;
This. customerinedit = NULL;
}
}
}

Public Class Customer
{
Private string companynamevalue;
Private string contactnamevalue;

Public customer ()
{
// Leave fields empty.
}

Public customer (string companyName, string contactname)
{
Companynamevalue = companyName;
Contactnamevalue = contactname;
}

Public String companyName
{
Get
{
Return companynamevalue;
}
Set
{
Companynamevalue = value;
}
}

Public String contactname
{
Get
{
Return contactnamevalue;
}
Set
{
Contactnamevalue = value;
}
}
}