Forms Data Controls :: Retrieve Changing Checkbox Value On Clicking Submit Button

I am trying to edit data using checkbox value. Firstly, I created popup window which using querystring some data from main page. In popup window, I want to change the checkbox value. For example, I made setSpare column and given the value to show bit data type such as 0 or 1 using checkbox(false or true). If some data has non setSpare(means 0), it wil lbe come out uncheckbox. If I want to check it and clicking submit button, It was not change. I am going to show the code below.

public partial class AddSpare : BasePage
{
string ObjectId;
protected void Page_Load(object sender, EventArgs e)
{
ObjectId = Request.QueryString["ObjectId"];
displayComInfo(ObjectId);
}
protected void displayComInfo(string ObjectId) // it informed relative data on web through using DB.
{
string query = "usp_ShowComputerList";
try
{
using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["SCSConnectionString2"].ConnectionString))
{
SqlCommand cmd = new SqlCommand(query, conn);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
SqlParameter paramobjectId = cmd.Parameters.Add("@ObjectId", System.Data.SqlDbType.Int);
paramobjectId.Value = ObjectId;
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
ModelTxt.Text = dr["Model"].ToString();
ModelTxt.ReadOnly = true;
ComputerTxt.Text = dr["ComputerName"].ToString();
ComputerTxt.ReadOnly = true;
userTxt.Text = dr["UserName"].ToString();
userTxt.ReadOnly = true;
ntTxt.Text = dr["NtLogon"].ToString();
ntTxt.ReadOnly = true;
HDDTxt.Text = dr["HddSize"].ToString() + "GB";
HDDTxt.ReadOnly = true;
RAMTxt.Text = dr["MemorySize"].ToString() + "GB";
RAMTxt.ReadOnly = true;
SerialNoTxt.Text = dr["SerialNo"].ToString();
SerialNoTxt.ReadOnly = true;
TextBox1.Text = dr["Spare"].ToString();
inputChkSpare.Checked = (bool)dr["Spare"]; //(bool)dr["Spare"] display false or true.
dr.Close();
}
}
}
catch (Exception ex)
{
MessagePanel1.Type = MessageType.Error;
MessagePanel1.Text = MessagePanel1.Text = "This is an error." + ex.Message;
}
}
protected void okBtn_Click(object sender, EventArgs e)
{
string query = "usp_SetSpare";
try
{
using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["SCSConnectionString2"].ConnectionString))
{
SqlCommand cmd = new SqlCommand(query, conn);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
SqlParameter paramobjectId = cmd.Parameters.Add("@objId", System.Data.SqlDbType.Int);
SqlParameter paramspare = cmd.Parameters.Add("@spare", System.Data.SqlDbType.Char);
paramobjectId.Value = ObjectId;
if (inputChkSpare.Checked == true) // if I change the check box, it does not bring the changed value. It will bring the above value(already displayed thing)
{
paramspare.Value = "1";
}
else {
paramspare.Value = "0";
}
conn.Open();
cmd.ExecuteNonQuery();
cancelBtn.Value = "Close";
okBtn.Enabled = false;
MessagePanel1.Type = MessageType.Information;
MessagePanel1.Text = "This computer is spare from now.";
}
}
catch (Exception ex)
{
MessagePanel1.Type = MessageType.Error;
MessagePanel1.Text = MessagePanel1.Text = "This is an error." + ex.Message;
}
}