Error: 'Oracle(tm) client and network componnents not found'

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ASP.NET

I am try to connect ASP.net application to oracle database. But i am getting the error as 'Oracle(tm) client and network componnents not found'. I have already installed this on my pc. I have used the below...

protected void Page_Load(object sender, EventArgs e)
    {
        string connString = "Driver={Microsoft ODBC for Oracle};Server=Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.55.60.140)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=MMS5x10)));User Id=mms5x_manager;Password=mms5x_manager;"; 
        
        OracleConnection conn = new OracleConnection(connString);
        if (conn.State != ConnectionState.Open)
            conn.Open();
        OdbcDataAdapter da = new OdbcDataAdapter("SELECT * FROM CO_DOWNLOAD_HISTORY", conn);
        DataSet ds = new DataSet("STDTABLE");
        da.Fill(ds, "STDTABLE");
        GridView1.DataSource = ds.DefaultViewManager;
        GridView1.DataBind();
        // Close connection
        if (conn.State == ConnectionState.Open)
            conn.Close();
    }