for example you can do something like this :
Load all tables in an XML File to dataset , loop through it , add table names to combobox .
Code:
System.Data.DataSet ds=new DataSet();
			ds.ReadXml("data.xml");
			
			for(int i = 0; i < ds.Tables.Count - 1; i++)
			{
				this.comboBox1.Items.Add(ds.Tables[i].TableName); 

			}