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Update/Delete buttons inside DataGridView not working after filtering results

C# winform application: i added buttons in datagridview in every row for (update,delete). it works fine but when i search data in this gridview the buttons doesn't work on search results.
Here is my code.
namespace MyBusiness
{
public partial class ExpenceDetails : Form
{
public ExpenceDetails()
{
InitializeComponent();
}
private void ExpenceDetails_Load(object sender, EventArgs e)
{
update();
}
DataTable data;
public void update()
{
string connectionstring = null;
SqlConnection cnn;
connectionstring = #"Server=(local)\SQLEXPRESS;Database=mrtraders;Trusted_Connection=True";
cnn = new SqlConnection(connectionstring);
try
{
cnn.Open();
dataGridView1.ColumnCount = 0;
SqlCommand cmd1 = new SqlCommand("SELECT * FROM Expense", cnn);
SqlDataReader reader = cmd1.ExecuteReader();
if (reader.HasRows)
{
data = new DataTable();
data.Load(reader);
dataGridView1.DataSource = data;
}
DataGridViewButtonColumn btn = new DataGridViewButtonColumn();
btn.Text = "Update";
btn.UseColumnTextForButtonValue = true;
dataGridView1.Columns.Add(btn);
DataGridViewButtonColumn btn2 = new DataGridViewButtonColumn();
btn2.Text = "Delete";
btn2.UseColumnTextForButtonValue = true;
dataGridView1.Columns.Add(btn2);
cnn.Close();
}
catch (Exception)
{
myMessageBox my = new myMessageBox("Internal Error...");
my.ShowDialog();
}
}
private void pictureBox1_Click(object sender, EventArgs e)
{
this.Close();
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 4)
{
if (e.RowIndex >= 0)
{
//// get ExpenseId//// IMP
int id = Convert.ToInt32(dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[0].Value);
string desc = Convert.ToString(dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[1].Value);
int am = Convert.ToInt32(dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[3].Value);
UpdateExpense a = new UpdateExpense(id,desc,am);
a.ShowDialog();
dataGridView1.DataSource = null;
update();
}
}
else if (e.ColumnIndex == 5)
{
if(e.RowIndex >= 0)
{
int id = Convert.ToInt32(dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[0].Value);
string connectionstring = null;
SqlConnection cnn;
connectionstring = #"Server=(local)\SQLEXPRESS;Database=mrtraders;Trusted_Connection=True";
cnn = new SqlConnection(connectionstring);
try
{
cnn.Open();
SqlCommand cmd1 = new SqlCommand("Delete FROM Expense where expenseId = '"+id+"' ", cnn);
cmd1.ExecuteNonQuery();
myMessageBox my = new myMessageBox("Deleted Successfully...");
my.ShowDialog();
dataGridView1.DataSource = null;
cnn.Close();
update();
}
catch (Exception)
{
myMessageBox my = new myMessageBox("Internal Error...");
my.ShowDialog();
}
}
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
DataView dv = new DataView(data);
dv.RowFilter = string.Format("Description like '%{0}%'", textBox1.Text);
dataGridView1.DataSource = dv.Table;
}
}
}

retrieving data from sqldatabase in gridview using background worker

Retrieving data from sqldatabase in gridview using background worker. Skips already added data and added an extra data of same type, using breakpoint or message-box it displays correct data, but not in datagridview! Anyone can point out where is the mistake in the below code? Any help is appreciated
private void button8_Click(object sender, EventArgs e)
{
//gridviewMain();
toolStripStatusLabel1.Visible = true;
progressBar1.Maximum = GetTotalRecords();
progressBar1.Visible = true;
dataGridView1.ColumnCount = 9;
dataGridView1.Columns[0].Name = "Accession No";
dataGridView1.Columns[1].Name = "Author";
dataGridView1.Columns[2].Name = "Title";
dataGridView1.Columns[3].Name = "Edition";
dataGridView1.Columns[4].Name = "ClassNo";
dataGridView1.Columns[5].Name = "BookNo";
dataGridView1.Columns[6].Name = "Subject";
dataGridView1.Columns[7].Name = "Department";
dataGridView1.Columns[8].Name = "Status";
dataGridView1.Columns[8].Visible = false;
if (!bgwFillDGV.IsBusy)
{
RetriveTableData TObj = new RetriveTableData();
dataGridView1.Rows.Clear();
bgwFillDGV.RunWorkerAsync(TObj);
}
}
private int GetTotalRecords()
{
SqlConnection con;
SqlCommand cmd;
try
{
using (con = new SqlConnection(connectionString))
{
cmd = new SqlCommand("SELECT COUNT(*) FROM tblBook", con);
con.Open();
TotalRecords = int.Parse(cmd.ExecuteScalar().ToString());
con.Close();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return TotalRecords;
}
public class RetriveTableData
{
public string AccessionNo;
public string Author;
public string Title;
public string Edition;
public string ClassNo;
public string BookNo;
public string Subject;
public string Department;
public string Status;
}
private void bgwFillDGV_DoWork(object sender, DoWorkEventArgs e)
{
RetriveTableData Obj = (RetriveTableData)e.Argument;
string SqlcmdString = "SELECT * from tblBook";
SqlDataReader reader;
int i = 1;
try
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
Sqlcmd = new SqlCommand(SqlcmdString, conn);
conn.Open();
reader = Sqlcmd.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
//int.Parse(reader["NO_IND"].ToString());
Obj.AccessionNo = reader["accessionNo"].ToString();
Obj.Author = reader["author"].ToString();
Obj.Title = reader["title"].ToString();
Obj.Edition = reader["edition"].ToString();
Obj.ClassNo = reader["classNo"].ToString();
Obj.BookNo = reader["bookNo"].ToString();
Obj.Subject = reader["subject"].ToString();
Obj.Department = reader["department"].ToString();
Obj.Status = reader["status"].ToString();
System.Threading.Thread.Sleep(100);
// To Report progress.0
MessageBox.Show(Obj.AccessionNo.ToString());
bgwFillDGV.ReportProgress(i, Obj);
if (bgwFillDGV.CancellationPending)
{
// Set the e.Cancel flag so that the WorkerCompleted event
// knows that the process was cancelled.
e.Cancel = true;
bgwFillDGV.ReportProgress(0);
return;
}
i++;
}
conn.Close();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void bgwFillDGV_ProgressChanged(object sender,
ProgressChangedEventArgs e)
{
if (!bgwFillDGV.CancellationPending)
{
RetriveTableData Obj = (RetriveTableData)e.UserState;
dataGridView1.Rows.Add(Obj.AccessionNo.ToString(), Obj.Author.ToString(), Obj.Title.ToString(), Obj.Edition.ToString(), Obj.ClassNo.ToString(), Obj.BookNo.ToString(), Obj.Subject.ToString(), Obj.Department.ToString(),Obj.Status.ToString());
progressBar1.Value = e.ProgressPercentage;
toolStripStatusLabel1.Text = "Processing row.. " + e.ProgressPercentage.ToString() + " of " + TotalRecords;
}
}
private DataTable objToDataTable(RetriveTableData obj)
{
RetriveTableData objmkt = new RetriveTableData();
sTable3.Columns.Add("AccessionNo",typeof(string));
sTable3.Columns.Add("Author", typeof(string));
sTable3.Columns.Add("Title", typeof(string));
sTable3.Columns.Add("Edition", typeof(string));
sTable3.Columns.Add("ClassNo", typeof(string));
sTable3.Columns.Add("BookNo", typeof(string));
sTable3.Columns.Add("Subject", typeof(string));
sTable3.Columns.Add("Department", typeof(string));
sTable3.Columns.Add("Status", typeof(string));
foreach (PropertyInfo info in
typeof(RetriveTableData).GetProperties())
{
sTable3.Rows.Add(info.Name);
}
sTable3.AcceptChanges();
return sTable3;
}

Display specific Column when checkbox is checked

I would like to display a specific column (date of birth, for an example) on a dataGridView which is connected to MS Access, when a checkbox (date of birth checkbox) is checked. It would help much more if it was an array, because I want to add more than one checkbox.
namespace emp_db1
{
public partial class Print : Form
{
private OleDbConnection connection = new OleDbConnection();
public Print()
{
InitializeComponent();
connection.ConnectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source = emp_0.mdb";
}
DataTable ds;
private void Print_Load(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "SELECT ID, Name, DOB FROM emp_per";
OleDbDataAdapter da = new OleDbDataAdapter(command);
ds = new DataTable();
da.Fill(ds);
dataGridView1.DataSource = ds;
da.Update(ds);
connection.Close();
dataGridView1.AutoResizeColumns();
dataGridView1.AutoResizeColumnHeadersHeight();
foreach (DataGridViewColumn col in dataGridView1.Columns)
{
col.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
col.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
}
this.dataGridView1.Sort(this.dataGridView1.Columns[0], ListSortDirection.Ascending);
}
catch (Exception ex)
{
MessageBox.Show("Error " + ex);
}
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
private void dob_check_CheckedChanged(object sender, EventArgs e)
{
}
}
}
thankyou.

Solution :
namespace emp_db1
{
public partial class Print : Form
{
List<CheckBox> chkboxes = new List<CheckBox>();
private OleDbConnection connection = new OleDbConnection();
public Print()
{
InitializeComponent();
connection.ConnectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source = emp_0.mdb";
}
DataTable ds;
private void Print_Load(object sender, EventArgs e)
{
chkboxes.Add(dob_check); //0
chkboxes.Add(mother_check); //1
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "SELECT ID, Name, DOB, Mother FROM emp_per";
OleDbDataAdapter da = new OleDbDataAdapter(command);
ds = new DataTable();
da.Fill(ds);
dataGridView1.DataSource = ds;
da.Update(ds);
connection.Close();
dataGridView1.AutoResizeColumns();
dataGridView1.AutoResizeColumnHeadersHeight();
foreach (DataGridViewColumn col in dataGridView1.Columns)
{
col.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
col.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
}
this.dataGridView1.Sort(this.dataGridView1.Columns[0], ListSortDirection.Ascending);
}
catch (Exception ex)
{
MessageBox.Show("Error " + ex);
}
}
private void refreshCheckBoxes(int id)
{
for(int x = 0; x < 2; x++)
{
if (!chkboxes[x].Checked) dataGridView1.Columns[x+2].Visible = false; else dataGridView1.Columns[x+2].Visible = true;
}
}
private void dataGridView1_CellContentClick_1(object sender, DataGridViewCellEventArgs e)
{
}
private void dob_check_CheckedChanged(object sender, EventArgs e)
{
refreshCheckBoxes(0);
}
private void mother_check_CheckedChanged(object sender, EventArgs e)
{
refreshCheckBoxes(1);
}
}
}

Null exception with comboBox

I am trying to display data from list of string passed from Main Form into this form but the problem is that I am getting all the time "System.ArgumentNullException" even though the data are correctly passed to the newly declared list. Am I missing something?
public LoginPage()
{
InitializeComponent();
}
WelcomePage secondForm = new WelcomePage();
SqlConnection con;
DataTable dt1 = new DataTable();
public static DataRow dRow2 = null;
public List<string> list = new List<string>();
private void btnSubmit_Click(object sender, EventArgs e)
{
string sql = #"SELECT * FROM [employeeAccount] WHERE [User Name] = #UserName AND [Password] = #Password ";
using (var cmd = new SqlCommand(sql, con))
{
con.Open();
cmd.Parameters.AddWithValue("#UserName", txtUserName.Text);
cmd.Parameters.AddWithValue("#Password", txtPassword.Text);
SqlDataReader reader = cmd.ExecuteReader();
dt1.Load(reader);
ListTransfer();
InputChecker();
con.Close();
}
}
private void LoginPage_Load(object sender, EventArgs e)
{
SqlDataAdapter da = new SqlDataAdapter();
con = new System.Data.SqlClient.SqlConnection();
con.ConnectionString = (#"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\employeeDatabase.mdf;Integrated Security=True");
}
private void InputChecker()
{
if (dt1.Rows.Count > 0)
{
this.Hide();
secondForm.Closed += (s, args) => this.Close();
secondForm.Show();
}
else
{
MessageBox.Show("Invalid input data!");
}
}
private void ListTransfer()
{
SqlDataAdapter da = new SqlDataAdapter("SELECT [Department] FROM [employeeTable]", con);
DataSet ds = new DataSet();
da.Fill(ds, "employeeTable");
//List<string> list = new List<string>();
foreach(DataRow row in ds.Tables["employeeTable"].Rows)
{
list.Add(row["Department"].ToString());
}
Department_wise_Employee_Details dep = new Department_wise_Employee_Details(list);
}
WelcomePage Form code:
public WelcomePage()
{
InitializeComponent();
}
HomePage thirdForm = new HomePage();
private void btnContinue_Click(object sender, EventArgs e)
{
this.Hide();
thirdForm.Closed += (s, args) => this.Close();
thirdForm.Show();
}
Then it gets to HomePage Form:
List<string> list = new List<string>();
public HomePage()
{
InitializeComponent();
}
public HomePage(List<string>list)
{
InitializeComponent();
this.list = list;
}
private void btn2_Click(object sender, EventArgs e)
{
Department_wise_Employee_Details fourthForm = new Department_wise_Employee_Details(new LoginPage().list);
fourthForm.Show();
}
And from there you get to the form where the data for comboBox I would like to use.

public HomePage()
{
InitializeComponent();
}
List<string> list=new List<string>();
private void ListTransfer()
{
SqlDataAdapter da = new SqlDataAdapter("SELECT [Department] FROM [employeeTable]", con);
DataSet ds = new DataSet();
da.Fill(ds, "employeeTable");
List<string> list = new List<string>();
foreach(DataRow row in ds.Tables["employeeTable"].Rows)
{
list.Add(row["Department"].ToString());
}
// Department_wise_Employee_Details dep = new Department_wise_Employee_Details(list);
}
Department_wise_Employee_Details fourthForm = new Department_wise_Employee_Details(list);
private void btn1_Click(object sender, EventArgs e)
{
fourthForm.Show();
}

From your code snippets it is obvious that dep instance in ListTransfer is never shown. Therefore, the click event where you add the items is from another instance which does not receive the list parameter.

C# Sqlite Select

I`m using this code to read from a sqlite table and add the row where it is to the DataGridview. The problem is that if I want to add the same item more than once, it will only add once. I want to be able to add as many items as I want.
private SQLiteConnection sql_con;
private SQLiteCommand sql_cmd;
private SQLiteDataAdapter DB;
private DataSet DS = new DataSet();
private DataTable DT = new DataTable();
private void btnAdicionaProduto_Click(object sender, EventArgs e)
{
string cmdInsereProdutos = "select codigo,Nome,Unidade,Valor from Produtos where codigo = #codigo";
InsereProdutosCaixa(cmdInsereProdutos);
if (dataGridViewProdutos.RowCount > 0)
{
dataGridViewProdutos.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
dataGridViewProdutos.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
dataGridViewProdutos.Columns[2].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
dataGridViewProdutos.Columns[3].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
for (int i = 0; i < dataGridViewProdutos.Columns.Count; i++)
{
int colw = dataGridViewProdutos.Columns[i].Width;
dataGridViewProdutos.Columns[i].AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
dataGridViewProdutos.Columns[i].Width = colw;
}
txtCodigo.Text = "";
txtCodigo.Focus();
}
}
private void InsereProdutosCaixa(string txtQuery)
{
try
{
SetConnection();
sql_con.Open();
sql_cmd = sql_con.CreateCommand();
sql_cmd.Parameters.AddWithValue("#codigo", txtCodigo.Text);
sql_cmd.CommandText = txtQuery;
SQLiteDataReader readerProduto = sql_cmd.ExecuteReader();
DT.Load(readerProduto);
dataGridViewProdutos.DataSource = DT;
sql_con.Close();
}
catch (SQLiteException e)
{
MessageBox.Show(e.ToString(), "ERRO");
}
}