How to excel column set datatable in C#?

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C#

MVVM

Hi I read the excel data and I want to throw the exceli datatable I read.
For example I want to have excel in a folder and throw it into the datatable in the same way as the values in the excel row, column.
I tried to do as follows, but I am taking errors. One of my mistakes is as follows.

This line:

Application app=new Excel.Application(); //this error is:Application is an ambiguous reference between Microsoft.Office.Interop.Excel.Application and System.Windows.Application.

What I have tried:

using(var conn=new OleDbDataAdapter("Select DISTINCT [File Number] FROM [Sheet1$]" ,conn);
var dt=new System.Data.DataTable();
da.Fill(dt);

Application app=new Application();   //this line error and this error 
Workbook book=null;
Worksheet sheet=null;
Range range=null;

app.Visible=false;
app.ScreenUpdating=false;
app.DisplayAlerts=false;

string Path=Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);

book=app.Workbooks.Open(Path + @" ", MissingValue,MissingValue,MissingValue);

range=sheet.get_Range("A1",Missing.Value);
range=range.get_End(XlDirection.xlToRight);
range=range.get_End(xlDirection.xlDown);

string downAddress=range.get_Address(false,false,xlReferenceStyle.xlA1,Type.Missing,Type.Missing);
range=sheet.get_Rane("A1",downAddress);
object[,] values=(object[,])range.Value2;

for(int j=1; j<=values.GetLenght(1); j++)
{
Console.Write("{0}",j);
}

for(int j=1; j<=values.GetLenght(0); j++)
{
Console.Write("{0}",j++);
}

Console.WriteLine();