how to save new excel file by save file dalog

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C#

Hello,

I'm using this code to open exel file and write, but it works only those file which are already created.
I want to create a new excel and then save my data.

myExcelApp = new Excel.ApplicationClass();
myExcelApp.Visible = false;
myExcelWorkbooks = myExcelApp.Workbooks;

SaveFileDialog save = new SaveFileDialog();
save.Filter = "Excel Files .xlsx|*.xlsx";

save.ShowDialog();
string sss = save.FileName;
String fileName = sss;

myExcelWorkbook = myExcelWorkbooks.Open(fileName, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue);
Excel.Worksheet myExcelWorksheet = (Excel.Worksheet)myExcelWorkbook.ActiveSheet;

String cellFormulaAsString = myExcelWorksheet.get_Range("A1", misValue).Formula.ToString();

string s;
int i = 1;

foreach (ListViewItem li in listView2.Items)
{
    s = "A" + i.ToString();

    myExcelWorksheet.get_Range(s, misValue).Formula = li.Text;
    i++;
}

myExcelWorkbooks.Close()