problem ado.net application

Question posted by: mo/-/sin (Guest) on August 19th, 2008 08:55 AM

hi. i m mohsin
i m making a gui application using c# at front end and sql server 2005
at backend...... i made a table in sql server 2005 with 4 columns and
in gui i used 4 text boxes and 4labels and three buttons. my full code
is mentioned below....... button1 is for add button2 is for save and
button3 is for delete...
the table is empty..but the lines prefix with ---- are giving
errors............ plz tel me why............ i also used a binding
navigator and bind all the columns correctly.............



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace CITY_HOSPITAL
{

public partial class Form20 : Form
{
DataTable dt;
DataRow dr;
string code;
public Form20()
{
InitializeComponent();

}

private void textBox3_TextChanged(object sender, EventArgs e)
{

}

private void Form20_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the
'cITY_HOSPITALDataSet.SERVICESMAINTENANCE' table. You can move, or
remove it, as needed.

this.sERVICESMAINTENANCETableAdapter.Fill(this.cIT Y_HOSPITALDataSet.SERVICESMAINTENANCE);
textBox1.Enabled = false;
textBox2.Enabled = false;
textBox3.Enabled = false;
textBox4.Enabled = false;
button2.Enabled = false;
}

private void button1_Click(object sender, EventArgs e)
{
button2.Enabled = true;
textBox2.Enabled = true;
textBox3.Enabled = true;
textBox4.Enabled = true;
textBox2.Text = "";
textBox3.Text = "";
textBox4.Text = "";
int ctr, len;
string codeval;
dt = cITY_HOSPITALDataSet.Tables["SERVICESMAINTENANCE"];
----- len = dt.Rows.Count - 1;
---- dr = dt.Rows[len];
code = dr["SERVICEID"].ToString();
codeval = code.Substring(1, 5);
ctr = Convert.ToInt32(codeval);
if ((ctr >= 1) && (ctr < 9))
{
ctr = ctr + 1;
textBox1.Text = "SER00" + ctr;
}
else if ((ctr >= 9) && (ctr < 99))
{
ctr = ctr + 1;
textBox1.Text = "SER0" + ctr;
}
else if (ctr >= 99)
{
ctr = ctr + 1;
textBox1.Text = "SER" + ctr;
}
button1.Enabled = false;
}

private void button2_Click(object sender, EventArgs e)
{
dt = cITY_HOSPITALDataSet.Tables["SERVICESMAINTENANCE"];
dr = dt.NewRow();
dr[0] = textBox1.Text;
dr[1] = textBox2.Text;
dr[2] = textBox3.Text;
dr[3] = textBox3.Text;
dt.Rows.Add(dr);

sERVICESMAINTENANCETableAdapter.Update(cITY_HOSPIT ALDataSet);
textBox2.Text = System.Convert.ToString(dr[0]);
textBox1.Enabled = false;
textBox2.Enabled = false;
textBox3.Enabled = false;
textBox4.Enabled = false;

this.sERVICESMAINTENANCETableAdapter.Fill(this.cIT Y_HOSPITALDataSet.SERVICESMAINTENANCE);
button1.Enabled = true;
button2.Enabled = false;
}

private void button3_Click(object sender, EventArgs e)
{
string code;
code = textBox1.Text;
if (textBox1.Text.Length == 0)
{
MessageBox.Show("PLEASE SELECT A VALID RECORD");
}
else
{
dr =
cITY_HOSPITALDataSet.Tables["SERVICESMAINTENANCE"].Rows.Find(code);
dr.Delete();

sERVICESMAINTENANCETableAdapter.Update(cITY_HOSPIT ALDataSet);
}

}

}

}

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