Hi Ahmed,
LabelRenderers are setup to work with a specific Shapefile/ColumnName so a LabelRenderer setup for one shapefile may not work work for another shapefile.
In the following example you can see that we have setup a LabelRenderer to poll data from the 'LANDNAME' column:
private void LoadPoly()
{
//Load the shape file.
Layer layer = new Layer(STR_POLY,true);
//Set and create the Threshold of the layer.
layer.ThresholdUnit = ThresholdUnits.miles;
Threshold threshold = new Threshold(15,0);
//set the propertier of the polygon.
Color color = Color.Silver;
SolidBrush solidbrush = new SolidBrush(color);
AreaSymbol areasymbol = new AreaSymbol(solidbrush);
SymbolRenderer render = new SymbolRenderer(areasymbol);
threshold.LabelRenderers.Add(GetLabelRenderer("LANDNAME",0));
threshold.SymbolRenderers.Add(render);
//add the threshold to the layer.
layer.Thresholds.Add(threshold);
map1.Layers.Add(layer);
}
You will need to check your shapefile's DBF to see what columns you have available to create labels from.