General - {0}的含义是什么，我们可以将其他数字替换为0，并且“格式”是否意味着图像的格式化

I'm Using ASP.NET. In the ItemTemplate of the DataList I dragged an image. In the imageURL, field binding, the Format = none or General - {0}. I want to know what is the meaning of General - {0}, and can we put other numbers instead of 0. Another issue is does this "Format" means formatting of the image or what?I'm Using ASP.NET. In the ItemTemplate of the D