Updating a Database

Updating a Database

Post by John » Sat, 21 Aug 2004 07:45:40


I am just learning asp.net and have hit a wall with the datagrid control. I
have populated a datagrid and am able to edit fields and retrieve the new
field values from the datagrid via the UpdateCommand event but when I try
and update the database with these new values it doesn't happen. The
database isn't updated and the datagrid doesnt change.

I fill the datagrid:

SqlDataAdapter SqlDa = new SqlDataAdapter (Sql, conn);
DataSet ds = new DataSet();
DataView source = new DataView(ds.Tables[0]);
dg1.DataSource = source;

That works fine. I have an edit column that lets you edit the data and when
i click update the update method runs fine.

the update method gets the textbox values from the datagrid then attempts to
update the datagrid/database like this:

string Sql = "UPDATE TABLE SET field1 = @DataGridValue WHERE id = xid);

SqlCommand sqlComm = new SqlCommand(sql, conn);
sqlComm.Parameters.Add("@DataGridValue, SqlDbType.NVarChar).Value =

sqlComm.Parameters.Add("@xid, SqlDbType.Int).Value = xid;

dg1.EditItemIndex = -1;

I have verified the SQL using hard coded values and I have verified that I
amretrieving the data from the datagrid correctly by writing it to a text
box on the web form, so why wont the update happen?

SOrry for the long winded post but I can't work this out after two days of


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