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Deleting from a DataGridView control

Posted on 2009-05-08
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Last Modified: 2012-05-06
Im extremly new to C# and i have a datagridview polpulated already but would like to know how i can delete a row in SQL using the datagridcontrol. I can delete a row from the datagridview but i want to apply that to SQL server db table too. Can anyone help?
I can specify the connection, DataAdaptor etc but im stuck after that. I would need to create A SQL DELETE command and update at the end but thats all i know
private void btnDelete_Click(object sender, EventArgs e)
        {
            System.Data.SqlClient.SqlConnection cnn = new System.Data.SqlClient.SqlConnection();
            conn = new SqlConnection(@"Data Source=<SQLInstance>;Initial Catalog=<Database>;Integrated Security=True");
            da = new SqlDataAdapter();
            ds = new DataSet();
            datagridview1.Rows.RemoveAt(datagridview1.CurrentRow.Index);  //applys delete to the gid but i want to delete the record in SQL too
 
        }

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Question by:wilko100
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4 Comments
 
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Expert Comment

by:ddayx10
ID: 24341633
HI,

I don't often use dataadapters as I use the disconnected model more often. I'm 99% sure thought that all you need do is assign the sqldataadapter.deletecommand, sqldataadapter.delete and finally rebind.

A short example:
da.DeleteCommand = "DELETE FROM tbl WHERE ColumnId =" + [GetValueFromDataGridView HERE]
da.Delete

Now fire through your original binding process, or since you've already removed the row you may not need to.

A more full scale example can be found at this link:
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter.deletecommand(VS.71).aspx
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wilko100 earned 0 total points
ID: 24342606
Yeah that makes sense, you know wht the syntax is the sql statement line? i know it would be something like "DELETE FROM Contact WHERE FirstName = "+{CurrentRowSelect}+" but you know what the bit in {} is? then is that all i need?

This is the code i have so far...
private void btnDelete_Click(object sender, EventArgs e)
        {
            System.Data.SqlClient.SqlConnection cnn = new System.Data.SqlClient.SqlConnection();
            conn = new SqlConnection(@"Data Source=<SQLInstanne>;Initial Catalog=<Database>;Integrated Security=True");
            comm = new SqlCommand("DELETE FROM Contact WHERE "+RowOfDataGrid+"");            
            da = new SqlDataAdapter();
            ds = new DataSet();
            comm.Connection = conn;
            da.DeleteCommand = comm;
            da.Fill(ds);
            conn.Open();
            datagridview1.DataSource = ds.Tables[0];
            var UserTable = (DataTable)datagridview1.DataSource;
            datagridview1.Rows.RemoveAt(datagridview1.CurrentRow.Index);
            
                    
            
        }

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Expert Comment

by:ddayx10
ID: 24342658
Well in SQL Delete you are going to delete based on a unique value of the row in question. Usually this is the primary key column.

I cant tell you exactly without building one myself, but I suspect it is something like this:

datagridview1.Rows(datagridview1.CurrentRow.Index).cells(index of your value).value;

Funny thing I wasnt aware a gridview had a property for "currentrow". It's not listed on MSDN as having that property, but you said you had it working already using that "removeat" code so Im going with it.

Dday
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Author Comment

by:wilko100
ID: 24343632
Yep the currentrow works a treat and really easy when its disconnected, im clueelss when i want to delete from within the backend! I used...(See code below) which removed the row selected, i just dont know what the syntax is for deleting the selected row

Would you guys say this is the order to delete?:
1) Create connection
2) Create DELETE Command (DELETE Counter, FirstName, LastName etc FROM [Table] WHERE Counter = "+Selected Row on Grid+");
3) Create DataAdaptor
4) Create Dataset
5) Update


private void btnDelete_Click(object sender, EventArgs e)
        {             
            
            
            [GridControlName].Rows.RemoveAt([GridControlName].CurrentRow.Index);           
                    
            
        }

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