'System.Convert' does not contain a definition for 'Toint32'

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C#3.5

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Collections;
using System .Collections.Generic ;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Data.OleDb;
using System.ComponentModel;

public partial class _Default : System.Web.UI.Page
{
class Point { double X, Y; }
DataTable dt = new DataTable();

protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnSubmit_Click(object sender, EventArgs e)
{
string connectionString = "";
if (FileUpload1.HasFile)
{
string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
string fileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName);
string fileLocation = Server.MapPath("~/App_Data/" + fileName);
FileUpload1.SaveAs(fileLocation);
if (fileExtension == ".xls")
{
connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileLocation + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
}
else if (fileExtension == ".xlsx")
{
connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileLocation + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
}
OleDbConnection con = new OleDbConnection(connectionString);
OleDbCommand cmd = new OleDbCommand();
ArrayList List = new ArrayList();
cmd.CommandType = System.Data.CommandType.Text;
cmd.Connection = con;
OleDbDataAdapter dAdapter = new OleDbDataAdapter(cmd);
DataTable dtExcelRecords = new DataTable();
con.Open();
DataTable dtExcelSheetName = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string getExcelSheetName = dtExcelSheetName.Rows[0]["Table_Name"].ToString();
cmd.CommandText = "SELECT * FROM [" + getExcelSheetName + "]";
dAdapter.SelectCommand = cmd;
dAdapter.Fill(dtExcelRecords);
if (Session["dtInSession"] != null)
{
dt = (DataTable)Session["dtInSession"];
}
for (int i = 0; i < dtExcelRecords.Rows.Count; i++)
{
//if you want to get the string
DataRow thisRow = (DataRow)dtExcelRecords.Rows[i];
int X = Convert.Toint32(thisRow["X"]);
int Y = Convert.Toint32 (thisRow["Y"]);
//double Length = Convert.ToDouble(Y);
//double X1 = Convert.ToDouble(X);
//double Y1 = Convert.ToDouble(Y);

DataRow dr = dt.NewRow();
polygonArea(X, Y);
}

}
}
//calculation
private Double polygonArea(int[] X, int[] Y)
{
Double area = 0.0;
int j = X.Length - 1;
for (int i = 0; i < X.Length; i++)
{
area = area + (X[j] + X[i] * (Y[j] - Y[i]));
j = i;
}
area = area / 2;
if (area < 0)
area = area * -1;
return area;
}

}