How To Close The Microsoft Jet database engine MS Access

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C#

The Microsoft Jet database engine cannot open the file It is already opened exclusively by another user, or you need permission to view its data.

This Error Disply after Handling The Code BY Using

string f = fu.PostedFile.FileName;
      
       string fileType = f.Split('.')[1];

        OleDbConnection excelCon = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + f + ";Extended Properties=Excel 8.0");

        if (excelCon.State == ConnectionState.Closed)
        {
            excelCon.Open();
        }
        
        OleDbCommand excelCom = new OleDbCommand("SELECT * FROM [Sheet1$]", excelCon);
        OleDbDataAdapter excelAdp = new OleDbDataAdapter(excelCom);
        DataSet excelDs = new DataSet();
        excelAdp.Fill(excelDs);
        
        gvSending.DataSource = excelDs.Tables[0];
        gvSending.DataBind();

        excelCon.Close();