In DataGrid, is it possible to add rows one by one at runtime. That means after entering data in one row next row will be added.

Yes, for this you have to use datatable and after inserting the first row in datatable u have to bind that datatable to the grid and next time , first u have to add the row in datatable and next bind it to datagrid. keep on doing.  
u have to maintain the datatable state. 
happy coding 
 
bye 
srinu

So Does that mean we can not stop datagrid displaying an empty row at runtime?

yes,

definitely, we can add row one by one

how?

Can you post example code about that Mr. srinu

Thanks

Yes,
Just apply same code for data load in Datagrid after Save.

Example
dim da as new sqldataadapter("select...",conn)
dimdsas new dataset
da.fill(ds,xyz)
dim dr as datarow
dr=ds.tables(0).rows.newrow
with dr
.items(0)=textbox1.text
.items(1)=textbox2.text
.items(2)=textbox3.text
ds.tables(0).addrow(dr)

datagrid1.datasource=ds.tables(0)

Yes, you can add rows one by one at runtime. for thatyou have to maintain DataTable and its ViewState. So after pageload data is not removed from datatable.

For display purpose you have to bind that datatable to grid.

for. exp;

Each and every time after adding rowto table you have to maintain its state.
ViewState["Temp"]=(DataTable)dt;

dg.DataSource=(DataTable)ViewState["Temp"];

and going on.

Thanks.