How Do I Compare Feature_Type_Id Of Gridview Rows With The Datavalue Of Dropdownlist.

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ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;


public partial class Default2 : System.Web.UI.Page
{
List<string> list = new List<string>();
protected void Page_Load(object sender, EventArgs e)
{
//BindData();
if (!IsPostBack)
{
selectFeatureType();
AddDefaultFirstRecord();
}
}

protected void selectFeatureType()
{
FeatureTypeRepository type = new FeatureTypeRepository();
IList<featuretype> FeatureType = type.GetAllFeatureType();
cmbFeatureType.DataSource = from m in FeatureType
select new { m.featureType, m.feature_type_id };
cmbFeatureType.DataTextField = "featureType";
cmbFeatureType.DataValueField = "feature_type_id";
cmbFeatureType.DataBind();

}

protected void cmbFeatureType_SelectedIndexChanged1(object sender, EventArgs e)
{
int id = Convert.ToInt32(cmbFeatureType.SelectedValue);
FeatureDescriptionRepository desc = new FeatureDescriptionRepository();
IList<featuredescription> FeatureDesc = desc.GetAllFeatureDescription();
cmbDescription.DataSource = from m in FeatureDesc
where m.feature_type_id == id
select new { m.description ,m.description_id };
cmbDescription.DataTextField = "description";
cmbDescription.DataValueField = "description_id";
cmbDescription.DataBind();

TextBox1.Text = cmbFeatureType.SelectedValue;
}


private void AddDefaultFirstRecord()
{
//creating dataTable
DataTable dt = new DataTable();
DataRow dr;
dt.TableName = "Feature";
dt.Columns.Add(new DataColumn("feature_type_id", typeof(int)));
dt.Columns.Add(new DataColumn("description_id", typeof(int)));
dt.Columns.Add(new DataColumn("FeatureType", typeof(string)));
dt.Columns.Add(new DataColumn("Description", typeof(string)));
dr = dt.NewRow();
dt.Rows.Add(dr);
//saving databale into viewstate
ViewState["Feature"] = dt;
//bind Gridview
GridView1.DataSource = dt;
GridView1.DataBind();
}

protected void btnAdd_Click(object sender, EventArgs e)
{
//CheckDuplicateFeature();
AddNewVehicleFeatureToGrid();
}
private void CheckDuplicateFeature()
{
// string bS = Convert.ToString(GridView1.Rows[rowIndex].Cells[2].Text);

// ClientScript.RegisterStartupScript(this.GetType(), "Success", "<script type='text/javascript'>alert('Cannot add same vehicle type!');window.location='Default2.aspx';</script>'");

}
private void AddNewVehicleFeatureToGrid()
{
if (ViewState["Feature"] != null)
{

//get datatable from view state
DataTable dtCurrentTable = (DataTable)ViewState["Feature"];
DataRow drCurrentRow = null;

if (dtCurrentTable.Rows.Count > 0)
{

for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//add each row into data table

drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["feature_type_id"] = cmbFeatureType.SelectedValue;
drCurrentRow["FeatureType"] = cmbFeatureType.SelectedItem.Text;
drCurrentRow["description_id"] = cmbDescription.SelectedValue;
drCurrentRow["Description"] = cmbDescription.SelectedItem.Text;
}
//Remove initial blank row
if (dtCurrentTable.Rows[0][0].ToString() == "")
{
dtCurrentTable.Rows[0].Delete();
dtCurrentTable.AcceptChanges();
}

//add created Rows into dataTable
dtCurrentTable.Rows.Add(drCurrentRow);
//Save Data table into view state after creating each row
ViewState["Feature"] = dtCurrentTable;

//Bind Gridview with latest Row
GridView1.DataSource = dtCurrentTable;
GridView1.DataBind();



int rowscount = GridView1.Rows.Count;
string id = cmbFeatureType.SelectedValue;
foreach (GridViewRow item in GridView1.Rows)
{
list.Add(item.Cells[0].Text);
// for (int i = 0; i < rowscount; i++)
// {
// list.Add(GridView1.Rows[i].Cells[0].Text);
// string bS = Convert.ToString(GridView1.Rows[1].Cells[0].Text);
//if (GridView1.Rows[i].Cells[0].Text == id)
//{
// TextBox1.Text = "Data already exist";
//}
if (list.Contains(id))
{
TextBox1.Text = "Data Already Exist";
}

}

}
}
}
}