Getting error while reading Excel sheet

Question

I'm getting the following Error:

ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

The code is written as :

protected void btnconnect_Click(object sender, EventArgs e)
    {
        OdbcConnection oConn = new OdbcConnection();
        oConn.ConnectionString = "Provider=MSDASQL.1;data source=D:\\Parallelminds_Lalit\\Lalit Profile\\Other\\Old Back up\\Lalit PC Bkp\\Projects\\All SBTS backup\\SBTS\\SBTS1.0\\Bin\\sample.xlsx;Extended Properties='Excel 12.0;Format=xlsx'";

        OdbcCommand oComm = new OdbcCommand();
        oComm.Connection = oConn;
        oComm.CommandText = "Select * From [aa$]";//aa is sheet name
        try
        {
            DataSet ds = new DataSet();
            OdbcDataAdapter oAdapter = new OdbcDataAdapter(oComm);
            oConn.Open();
            oAdapter.Fill(ds);
            dataGridView1.DataSource = ds;
            dataGridView1.DataBind();
            dataGridView1.DataMember = ds.Tables[0].TableName;

        }
        finally
        {
            oConn.Close();
        }
    }

Why am I getting this error?