How to set checkbox always checked when user redirect to another page? - asp.net

Question

How do I implement my checkbox to stay check as it is even if user redirects to another page? Example, in my code behind when I check the checkbox the system updates the database and it says "Validated" , but when I press GoBackTeacher_Click event it will redirect to another page. In that another page there is a button function there that will redirect to this current page where my code behind function is implemented and checkbox is checked.
Aspx Code:
<div class="container" style="text-align: center; margin: 0 auto;">
<br />
<h1>Validation of Subjects</h1>
<br />
<asp:GridView runat="server" CssClass="table table-hover table-bordered" ID="ValidateSubject" Style="text-align: center"></asp:GridView>
</div>
<div style="float: right; padding-right: 75px;">
<button type="button" runat="server" class="btn btn-success" onserverclick="GoBackTeacher_Click">Go Back</button>
</div>
Code Behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
namespace SoftwareAnalysisAndDesign.SAD
{
public partial class ValidateSubjectTeacher : System.Web.UI.Page
{
CheckBox check = new CheckBox();
protected void Page_Load(object sender, EventArgs e)
{
if (Session["ValidateSubject"] == null)
{
Response.Redirect("TeacherPage.aspx", true);
}
if (!IsPostBack)
{
ValidateSubject.DataSource = Session["ValidateSubject"];
ValidateSubject.DataBind();
}
//Add a checkbox in the last row of GridView Progmatically
foreach (GridViewRow row in ValidateSubject.Rows)
{
check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox; //position Check column on last row in gridview
check.Enabled = true;
check.CheckedChanged += ValidateSubject_Click; //Bind the event on the button
check.AutoPostBack = true; //Set the AutoPostBack property to true
}
}
protected void ValidateSubject_Click(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
GridViewRow grvRow = (GridViewRow)chk.NamingContainer;//This will give row
string validated = "Validated";
string notyetvalidated = "Not yet validated";
string studid = grvRow.Cells[0].Text;
string coursenum = grvRow.Cells[1].Text;
if (chk.Checked)
{
grvRow.Cells[10].Text = validated;
//Open Connection
using (SqlConnection conn = new SqlConnection("Data Source=Keith;Initial Catalog=SAD;Integrated Security=True"))
{
//Open Connection to database
try
{
conn.Open();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
using (SqlCommand cmd = new SqlCommand("Update AssessmentForm set Status = #Validated where StudentID = #studentID and CourseNo = #Coursenumber" ,conn))
{
cmd.Parameters.AddWithValue("#Validated", validated);
cmd.Parameters.AddWithValue("#studentID", studid);
cmd.Parameters.AddWithValue("#Coursenumber", coursenum);
cmd.ExecuteNonQuery();
}
//Close Connection to database
try
{
conn.Close();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
}
}
else
{
grvRow.Cells[10].Text = notyetvalidated;
//Open Connection
using (SqlConnection conn = new SqlConnection("Data Source=Keith;Initial Catalog=SAD;Integrated Security=True"))
{
//Open Connection to database
try
{
conn.Open();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
//query database to update the Status
using (SqlCommand cmd = new SqlCommand("Update AssessmentForm set Status = #Validated where StudentID = #studentID and CourseNo = #Coursenumber", conn))
{
cmd.Parameters.AddWithValue("#Validated", notyetvalidated);
cmd.Parameters.AddWithValue("#studentID", studid);
cmd.Parameters.AddWithValue("#Coursenumber", coursenum);
cmd.ExecuteNonQuery();
}
//Close Connection to database
try
{
conn.Close();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
}
}
}
protected void GoBackTeacher_Click(object sender, EventArgs e)
{
Response.Redirect("TeacherPage.aspx");
}
}
}
To further understand my question, here is an image to further explain it.
This is when I check the checkbox without pressing the go back button
And this where I go pressed the go back button and in the another page there is a proceed button to redirect to this current page where my gridview is located.
There the checkbox is unchecked, and the status says it is validated. How do I implement my code that checkbox stay checked?
Is it something to do with postback? Please help.
UPDATE
I've tried this, it will stay checked my redirecting to this page, but when checkbox is clicked the status will not change from "Validated" to "Not yet validated" it will not change on postback when clicked.
foreach (GridViewRow row in ValidateSubject.Rows)
{
bool isChecked = default(bool);
if (row.Cells[row.Cells.Count - 2].Text.Equals("Validated")) // Here please assign the position of **Status** column.
{
isChecked = true;
check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox; //position Check column on last row in gridview
check.Enabled = true;
check.CheckedChanged += ValidateSubject_Click; //Bind the event on the button
check.AutoPostBack = true; //Set the AutoPostBack property to true
check.Checked = isChecked; //Set checkbox checked based on status ;
}
else if (row.Cells[row.Cells.Count - 2].Text.Equals("Not yet validated"))
{
isChecked = false;
check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox; //position Check column on last row in gridview
check.Enabled = true;
check.CheckedChanged += ValidateSubject_Click; //Bind the event on the button
check.AutoPostBack = true; //Set the AutoPostBack property to true
check.Checked = isChecked; //Set checkbox checked based on status ;
}
}
In this function, the condition above will not changed the database, instead it will only refresh the page when checkbox is clicked.
protected void ValidateSubject_Click(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
GridViewRow grvRow = (GridViewRow)chk.NamingContainer;//This will give row
string validated = "Validated";
string notyetvalidated = "Not yet validated";
string studid = grvRow.Cells[0].Text;
string coursenum = grvRow.Cells[1].Text;
if (chk.Checked)
{
grvRow.Cells[10].Text = validated;
//Open Connection
using (SqlConnection conn = new SqlConnection("Data Source=Keith;Initial Catalog=SAD;Integrated Security=True"))
{
//Open Connection to database
try
{
conn.Open();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
using (SqlCommand cmd = new SqlCommand("Update AssessmentForm set Status = #Validated where StudentID = #studentID and CourseNo = #Coursenumber" ,conn))
{
cmd.Parameters.AddWithValue("#Validated", validated);
cmd.Parameters.AddWithValue("#studentID", studid);
cmd.Parameters.AddWithValue("#Coursenumber", coursenum);
cmd.ExecuteNonQuery();
}
//Close Connection to database
try
{
conn.Close();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
}
}
else
{
grvRow.Cells[10].Text = notyetvalidated;
//Open Connection
using (SqlConnection conn = new SqlConnection("Data Source=Keith;Initial Catalog=SAD;Integrated Security=True"))
{
//Open Connection to database
try
{
conn.Open();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
//query database to update the Status
using (SqlCommand cmd = new SqlCommand("Update AssessmentForm set Status = #Validated where StudentID = #studentID and CourseNo = #Coursenumber", conn))
{
cmd.Parameters.AddWithValue("#Validated", notyetvalidated);
cmd.Parameters.AddWithValue("#studentID", studid);
cmd.Parameters.AddWithValue("#Coursenumber", coursenum);
cmd.ExecuteNonQuery();
}
//Close Connection to database
try
{
conn.Close();
}
catch (Exception E)
{
Console.WriteLine(E.ToString());
}
}
}
}

Answer 1

You need to modify your Page_Load method in the section where you are iterating inside gridview rows and assigning handlers and setting checkbox property.
In gridview the status column I guess you are saving it at text not a bit so I compared it as text. See following and implement same.
foreach (GridViewRow row in ValidateSubject.Rows)
{
bool isChecked = default(bool);
if (row.Cells[row.Cells.Count - 1].Text.Equals("Validated")) // Here please assign the position of **Status** column.
isChecked = true;
check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox; //position Check column on last row in gridview
check.Enabled = true;
check.CheckedChanged += ValidateSubject_Click; //Bind the event on the button
check.AutoPostBack = true; //Set the AutoPostBack property to true
check.Checked = isChecked //Set checkbox checked based on status ;
}