Hello!
Please look at this possible solution for your problem.
The key points:
1. Overriding getDragData function of Ext.grid.GridDragZone,
2. Using GetDragDropText section of GridPanel control and returning empty string from its handler.
Example
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!X.IsAjaxRequest)
{
Store store = this.GridPanel1.Store.Primary;
store.DataSource = new object[] {
new object[] {"3m Co"},
new object[] {"Alcoa Inc"},
new object[] {"Altria Group Inc"}
};
store.DataBind();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Ext.Net Example</title>
<ext:ResourcePlaceHolder runat="server" />
<script type="text/javascript">
Ext.grid.GridDragZone.override({
getDragData: function(e) {
var t = Ext.lib.Event.getTarget(e);
var rowIndex = this.view.findRowIndex(t);
var cellIndex = this.view.findCellIndex(t);
if (rowIndex !== false) {
var sm = this.grid.selModel;
if (Ext.isDefined(sm.getSelectedCell)) { // sm is CellSelectionModel?
if (!sm.getSelectedCell() || !(sm.getSelectedCell()[0] == rowIndex) ||
!(sm.getSelectedCell()[1] == cellIndex) ||
e.hasModifier() || sm.keepSelectionOnClick == "always") {
sm.handleMouseDown(this.grid, rowIndex, cellIndex, e);
}
return { grid: this.grid, ddel: this.ddel, rowIndex: rowIndex, cellIndex: cellIndex };
} else {
if (!sm.isSelected(rowIndex) || e.hasModifier() || sm.keepSelectionOnClick == "always") {
sm.handleMouseDown(this.grid, rowIndex, e);
}
return { grid: this.grid, ddel: this.ddel, rowIndex: rowIndex, selections: sm.getSelections() };
}
}
return false;
}
});
</script>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:GridPanel
ID="GridPanel1"
runat="server"
AutoHeight="true"
EnableDragDrop="true">
<Store>
<ext:Store runat="server">
<Reader>
<ext:ArrayReader>
<Fields>
<ext:RecordField Name="company" />
</Fields>
</ext:ArrayReader>
</Reader>
</ext:Store>
</Store>
<ColumnModel runat="server">
<Columns>
<ext:Column Header="Company" DataIndex="company" />
</Columns>
</ColumnModel>
<SelectionModel>
<ext:CellSelectionModel runat="server" />
</SelectionModel>
<GetDragDropText Handler="return '';"/>
</ext:GridPanel>
</form>
</body>
</html>