Updating and Deleting coding from Access to C#.net

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Hi,
How to write the coding for Update and Delete button in C#.For data base i'm using Access 2007.I have tried the code but it s not working showing error the below code which i have used,
string nam;
WeightBridge.Class1 obj = new WeightBridge.Class1();
nam = obj.get();
OleDbConnection con = new OleDbConnection(nam);
con.Open();
OleDbCommand cmd = new OleDbCommand("Update SupplierMaster SET [SupplierCode]='" +textBox2.Text + "',[SupplierName]='" +textBox1.Text + "',[SupplierCode]='" + ID + "' ", con);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("SupplierMaster Updated Successfully");

Posted 4-Jan-13 23:04pm

Balamurugan1989

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DR Delphi 6-Jan-13 12:12pm

What does the Error say exactly..? also I would recommend using Parameterized Query's when working with DBMS's this will eliminate any possibility of Sql Injection can you also show what the connection string is to the Access 2007 Database...

2 solutions

Solution 1

Within the SQL command you provided, SupplierCode field is specified twice.

Probably You have forgot to specify the WHERE clause, and maybe you also mistyped the last field name.

Regards,
Daniele.

Posted 6-Jan-13 22:02pm

Daniele Rota Nodari

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Balamurugan1989 17-Jan-13 5:56am

Ya i have mentioned in WHERE clause itself...

Daniele Rota Nodari 17-Jan-13 7:38am

OK but...
In the original code, no WHERE clause was present and SupplierCode was present two times inside the SET clause.
Did the error occur due to oneor both of these things, thus fixing them the error was resolved?
If so please mark the solution as correct; otherwise let us kindly know where was the problem.

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Balamurugan1989 · Accepted Answer · 2013-01-07T00:26:00

For Updating from access to C# we should follow the below code,
private void button1_Click(object sender, EventArgs e)
{
string nam;
WeightBridge.Class1 obj = new WeightBridge.Class1();
nam = obj.get();
nam = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=d:\\weightbridge.accdb;Persist Security Info=False;";
OleDbConnection con = new OleDbConnection(nam);
con.Open();
OleDbCommand cmd = new OleDbCommand("Update SupplierMaster SET [SupplierCode]=" +textBox2.Text + ",[SupplierName]='" +textBox1.Text + "' WHERE [SupplierCode]=" + ID + " ", con);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("SupplierMaster Updated Successfully");
this.SupplierMaster_Load(new object(),new EventArgs());
}
For Deleing from access to C# we should follow the below code,
private void button2_Click(object sender, EventArgs e)
{
string nam;
WeightBridge.Class1 obj = new WeightBridge.Class1();
nam = obj.get();
nam = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=d:\\weightbridge.accdb;Persist Security Info=False;";
OleDbConnection con = new OleDbConnection(nam);
con.Open();
OleDbCommand cmd = new OleDbCommand("Delete from SupplierMaster where [SupplierCode]=" + ID + " ", con);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Deleted Successfully");
this.SupplierMaster_Load(new object(), new EventArgs());

}