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Raymond Chiu
4695
Object reference not set to an instance of an object.
posted

Dear all,

I have below code and don't know why in datasource=, it throw exception??

DataSet ds1 = new DataSet();
            ds1.Tables.Add(this.itemListTable);
            ds1.Tables.Add(this.productListTable);
            ds1.Tables.Add(this.categoryListTable);
            ds1.Relations.Add(ds1.Tables["List1"].Columns["PromoCode"], ds1.Tables["ProductInfo"].Columns["PromoCode"]);
            ds1.Relations.Add(ds1.Tables["List1"].Columns["PromoCode"], ds1.Tables["CategoryInfo"].Columns["PromoCode"]);

            this.ultraGrid1.DataSource = ds1;   // throw exception here

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  • 469350
    Offline posted

    Hi,

    Can you post the Call Stack of the exception?

    It's hard to guess without that information. But my guesses would be:

    • Your grid has a DataMember set which does not exist in the new DataSet you are attaching.
    • You are handling some events of the grid such as InitializeLayout or InitializeRow and your code is trying to reference an object (cell or column) that does not exist.

     

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