Хотелось бы, чтобы это помогло
просто попробуйте это ..
@ CLASS
using System.Data;
using System.Data.SqlClient;
namespace WindowsFormsApplication2
{
class clsDB
{
public SqlDataAdapter mDataAdapter = new SqlDataAdapter();
public DataSet mDataSet = new DataSet();
public SqlConnection mConn;
public clsDB()
{
mConn = new SqlConnection("Data Source=(the data source);Initial Catalog=sample;User ID=(the id);Password=(the password)");
}
public void SQLDB(string strSQL)
{
try
{
mDataAdapter = new SqlDataAdapter(new SqlCommand(strSQL, mConn));
mDataSet = new DataSet();
mDataAdapter.Fill(mDataSet);
}
catch (Exception ex)
{
throw ex;
}
finally
{
mConn.Close();
}
}
public void ClearRes()
{
mDataAdapter.Dispose();
mDataAdapter = null;
mDataSet.Dispose();
if (mConn.State != ConnectionState.Closed)
{
mConn.Close();
}
}
}
}
@ ВХОД
public partial class Login : Form
{
clsDB x = new clsDB();
public Login()
{
InitializeComponent();
}
private void btnSubmit_Click(object sender, EventArgs e)
{
x.SQLDB("select * from tbl_accounts where u_username ='" + txtUser.Text + "' and u_password ='" + txtPass.Text + "'");
if (x.mDataSet.Tables[0].Rows.Count > 0)
{
Main a = new Main();
this.Hide();
a.Show();
}
else
{
MessageBox.Show("wrong username or password");
}
}
@ ГЛАВНЫЙ ДОСТУП
namespace WindowsFormsApplication2
{
public partial class Main : Form
{
clsDB x = new clsDB();
public Main()
{
InitializeComponent();
}
private void btnAdd_Click(object sender, EventArgs e)
{
x.SQLDB("insert into tbl_info (u_lastname, u_firstname, u_middlename) values ('" + atxtLN.Text + "','" + atxtFN.Text + "','" + atxtFN.Text + "')");
fillgrid();
}
private void Main_Load(object sender, EventArgs e)
{
x.SQLDB(" select * from tbl_info ");
dgv1.DataSource = x.mDataSet.Tables[0];
fillgrid();
}
void fillgrid()
{
x.SQLDB("select * from tbl_info");
dgv1.DataSource = null;
dgv1.DataSource = x.mDataSet.Tables[0];
}
void search()
{
x.SQLDB("SELECT * from tbl_info where u_id like '" + etxtID.Text + "%' order by u_id");
if (x.mDataSet.Tables[0].Rows.Count > 0)
{
x.mDataAdapter.Fill(x.mDataSet, "tbl_info");
dgv1.DataSource = x.mDataSet.Tables["tbl_info"].DefaultView;
etxtLN.Text = dgv1.Rows[dgv1.CurrentRow.Index].Cells["u_lastname"].Value.ToString();
etxtFN.Text = dgv1.Rows[dgv1.CurrentRow.Index].Cells["u_firstname"].Value.ToString();
etxtMN.Text = dgv1.Rows[dgv1.CurrentRow.Index].Cells["u_middlename"].Value.ToString();
}
else if (etxtID.Text == "Type User ID to Edit")
{
etxtLN.Text = "";
etxtFN.Text = "";
etxtMN.Text = "";
}
else
{
etxtLN.Text = "";
etxtFN.Text = "";
etxtMN.Text = "";
}
}
private void etxtID_TextChanged(object sender, EventArgs e)
{
}
private void etxtID_Enter(object sender, EventArgs e)
{
etxtID.Text = "";
etxtID.ForeColor = Color.Black;
}
private void etxtID_Leave(object sender, EventArgs e)
{
if (etxtID.Text == "")
{
etxtID.ForeColor = Color.Gray;
etxtID.Text = "Type User ID to Edit";
x.SQLDB(" select * from tbl_info ");
dgv1.DataSource = x.mDataSet.Tables[0];
fillgrid();
}
}
private void etxtID_KeyUp(object sender, KeyEventArgs e)
{
search();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
x.SQLDB("UPDATE tbl_info set u_lastname ='" + etxtLN.Text + "', u_firstname ='" + etxtFN.Text + "', u_middlename ='" + etxtMN.Text + "' where u_id =" + etxtID.Text);
MessageBox.Show("Operation Successful!");
fillgrid();
}
private void btnDelete_Click(object sender, EventArgs e)
{
x.SQLDB("delete from tbl_info where u_id =" + dtxtID.Text + "");
MessageBox.Show("Operation Successful!");
fillgrid();
}
}
}