Dynamically adding rows to a datgrid view

[ggeorgiou01]

Hi all,

I have a windows application and a couple of text entry textboxes, which once filled in, and the button has been clicked, will enter a row into a datagrid.... this works fine (see code)

if (this.CustomerInfoUc.OrderLinesDg.Rows.Count == 0)
{
DataTable dt = new DataTable("test");
DataColumn dc = new DataColumn();
DataRow dr;

dc = new DataColumn();
dc.DataType = Type.GetType("System.Int32");
dc.ColumnName = "Line";
dc.AutoIncrement = true;
dc.AutoIncrementSeed = 1;
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.String");
dc.ColumnName = "Code";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.String");
dc.ColumnName = "Description";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.String");
dc.ColumnName = "ExpCode";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.Int32");
dc.ColumnName = "Qty";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.String");
dc.ColumnName = "Unit";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.Decimal");
dc.ColumnName = "Price";
dt.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = Type.GetType("System.Decimal");
dc.ColumnName = "Total";
dt.Columns.Add(dc);

dr = dt.NewRow();
dr["Code"] = CodeTb.Text;
dr["Description"] = DescriptionTb.Text;
dr["ExpCode"] = ExpCodeTb.Text;
dr["Qty"] = QtyTb.Text;
dr["Unit"] = UnitTb.Text;
dr["Price"] = PriceTb.Text;
dr["Total"] = TotalPriceTb.Text;
dt.Rows.Add(dr);

this.CustomerInfoUc.OrderLinesDg.DataSource = dt;
StatusLb.Text = "Order line added";

ClearDataGridTextFields();
}
else
{

}

But when i enter some more data into my textboxes and click the button, instead of adding a new row to the datagrid, it overwrites the first row....

How do i go about adding a row, beneath my already added row ?

 

[markknowsley]

I think the problem is here:

if (this.CustomerInfoUc.OrderLinesDg.Rows.Count == 0)
{
DataTable dt = new DataTable("test");

You're creating the datatable everytime this condition validates true, so you're only ever going to see one row of the new datatable.

To remedy this, declare your datatable and datacolumns just once at the start of your function / class and then write to it when you click your button.