Winform export Excel

This is how to export dataset to excel. Just modify it.
1. Reference COM component excel. dll

2. The implementation is as follows:

Public void exportexcel (){
Dataset DS = This. dataset; // obtain the dataset bound to the DataGrid.
If (DS = NULL) return;

String savefilename = "";
Bool filesaved = false;
Savefiledialog savedialog = new savefiledialog ();
Savedialog. defaultext = "xls ";
Savedialog. Filter = "Excel file | *. xls ";
Savedialog. filename = "sheet1 ";
Savedialog. showdialog ();
Savefilename = savedialog. filename;
If (savefilename. indexof (":") <0) return; // canceled

Excel. Application xlapp = new excel. Application ();

If (xlapp = NULL ){
MessageBox. Show ("an Excel object cannot be created, maybe your computer has not installed excel ");
Return;
}

Excel. workbooks = xlapp. workbooks;
Excel. Workbook workbook = workbooks. Add (Excel. xlwbatemplate. xlwbatworksheet );
Excel. worksheet = (Excel. worksheet) Workbook. worksheets [1]; // get sheet1
Excel. Range range;

String oldcaption = This. captiontext;
Long totalcount = Ds. Tables [0]. Rows. count;
Long rowread = 0;
Float percent = 0;

Worksheet. cells [1, 1] = This. captiontext;
// Write Fields
For (INT I = 0; I <Ds. Tables [0]. Columns. Count; I ++ ){
Worksheet. cells [2, I + 1] = Ds. Tables [0]. Columns [I]. columnname;
Range = (Excel. Range) worksheet. cells [2, I + 1];
Range. Interior. colorindex = 15;
Range. Font. Bold = true;

}
// Write Value
This. captionvisible = true;
For (INT r = 0; r <Ds. Tables [0]. Rows. Count; r ++ ){
For (INT I = 0; I <Ds. Tables [0]. Columns. Count; I ++ ){
Worksheet. cells [R + 3, I + 1] = Ds. Tables [0]. Rows [r] [I];
}
Rowread ++;
Percent = (float) (100 * rowread)/totalcount;
This. captiontext = "exporting data [" + percent. tostring ("0.00") + "%]...";
Application. doevents ();
}
This. captionvisible = false;
This. captiontext = oldcaption;

Range = worksheet. get_range (worksheet. cells [2, 1], worksheet. cells [Ds. tables [0]. rows. count + 2, DS. tables [0]. columns. count]);
Range. borderaround (Excel. xllinestyle. xlcontinuous, Excel. xlborderweight. xlthin, Excel. xlcolorindex. xlcolorindexautomatic, null );

Range. Borders [Excel. xlbordersindex. xlinsidehorizontal]. colorindex = excel. xlcolorindex. xlcolorindexautomatic;
Range. Borders [Excel. xlbordersindex. xlinsidehorizontal]. linestyle = excel. xllinestyle. xlcontinuous;
Range. Borders [Excel. xlbordersindex. xlinsidehorizontal]. Weight = excel. xlborderweight. xlthin;

If (Ds. Tables [0]. Columns. Count> 1 ){
Range. Borders [Excel. xlbordersindex. xlinsidevertical]. colorindex = excel. xlcolorindex. xlcolorindexautomatic;
Range. Borders [Excel. xlbordersindex. xlinsidevertical]. linestyle = excel. xllinestyle. xlcontinuous;
Range. Borders [Excel. xlbordersindex. xlinsidevertical]. Weight = excel. xlborderweight. xlthin;
}

If (savefilename! = ""){
Try {
Workbook. Saved = true;
Workbook. savecopyas (savefilename );
Filesaved = true;
} Catch (exception ex ){
Filesaved = false;
MessageBox. Show ("An error occurred while exporting the file. The file may be opened! \ N "+ ex. Message );
}
} Else {
Filesaved = false;
}
Xlapp. Quit ();
GC. Collect (); // forcibly destroy
If (filesaved & file. exists (savefilename) system. Diagnostics. process. Start (savefilename );

}