i am using database with table RESUME and column PageIndex in it which type is number in database but when i want to store this PageIndex value to an integer i get exception error

Specified cast is not valid.

here is the code

string sql;
string conString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=D:\\Deliverable4.accdb";
protected OleDbConnection rMSConnection;
protected OleDbDataAdapter rMSDataAdapter;
protected DataSet dataSet;
protected DataTable dataTable;
protected DataRow dataRow;

on Button Click

sql = "select PageIndex from RESUME";
rMSConnection = new OleDbConnection(conString);
rMSDataAdapter = new OleDbDataAdapter(sql, rMSConnection);
dataSet = new DataSet("pInDex");
rMSDataAdapter.Fill(dataSet, "RESUME");

dataTable = dataSet.Tables["RESUME"];

int pIndex = (int)dataTable.Rows[0][0];

rMSConnection.Close();

if (pIndex == 0)
{            
    Response.Redirect("Create Resume-1.aspx");
}
else if (pIndex == 1)
{            
    Response.Redirect("Create Resume-2.aspx");
}
else if (pIndex == 2)
{          
        Response.Redirect("Create Resume-3.aspx");
    }
}

i am getting error in this line

int pIndex = (int)dataTable.Rows[0][0];