I have found the answer for my question. Please look at below mentioned code,
IDocument doc = ArcMap.Application.Document;
IMxDocument mxDoc = doc as IMxDocument;
IMap map = mxDoc.FocusMap;
ILayer layer = map.get_Layer(0);
ESRI.ArcGIS.Carto.IFeatureLayer featureLayer = (ESRI.ArcGIS.Carto.IFeatureLayer)layer;
ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureLayer.FeatureClass;
ESRI.ArcGIS.Geodatabase.IDataset dataSet = (ESRI.ArcGIS.Geodatabase.IDataset)featureClass;
ESRI.ArcGIS.esriSystem.IPropertySet propertySet = dataSet.Workspace.ConnectionProperties;
object propertyNames;
object propertyValues;
propertySet.GetAllProperties(out propertyNames, out propertyValues);
System.Array propNameArray = (System.Array)propertyNames;
System.Array propValuesArray = (System.Array)propertyValues;