Index was out of range Must be non-negative and less than the size of the collection parameter name index

Question

I m trying to add data as one by one row to a datagridview here is my code and it says       Index was out of range  Must be non-negative and less than the size of the collection   parameter name index    What does this mean  What is the problem in my code   String Sqlstr2    select ItemName from Item where ItemID        tbItemID Text        db DataRead Sqlstr2   string ItemName   db dr  ItemName   ToString      DataGridView dataGridView1   new DataGridView     dataGridView1 Columns 0  Name    ItemID   dataGridView1 Columns 1  Name    ItemName   dataGridView1 Columns 2  Name    Qty   dataGridView1 Columns 3  Name    UnitPrice   dataGridView1 Columns 4  Name    Amount    string firstColum   tbItemID Text  string secondColum   ItemName  string thirdColum   tbQuantity Text  string fourthColum   Convert ToString UnitPrice   string fifthColum   Convert ToString sum    string   row   new string    firstColum  secondColum  thirdColum  fourthColum  fifthColum    dataGridView1 Rows Add row

User · Answer

what this means   is there any problem in my code   It means that you are accessing a location or index which is not present in collection   To find this  Make sure your Gridview has 5 columns as you are using it s 5th column by this line  dataGridView1 Columns 4  Name    Amount     Here is the image which shows the elements of an array  So if your gridview has less column then the  index   1  by which you are accessing it  then this exception arises

User · Answer

This error is caused when you have enabled paging in Grid view  If you want to delete a record from grid then you have to do something like this   int index   Convert ToInt32 e CommandArgument   int i   index   20     Here 20 is my GridView s Page Size  GridViewRow row   gvMainGrid Rows i   int id   Convert ToInt32 gvMainGrid DataKeys i  Value   new GetData   DeleteRecord id   GridView1 DataSource   RefreshGrid    GridView1 DataBind      Hope this answers the question

User · Answer

The error says  The index is out of range   That means you were trying to index an object with a value that was not valid  If you have two books  and I ask you to give me your third book  you will look at me funny  This is the computer looking at you funny  You said -  create a collection   So it did  But initially the collection is empty  not only is there nothing in it - it has no space to hold anything   It has no hands     Then you said  the first element of the collection is now  ItemID    And the computer says  I never was asked to create space for a  first item     I have no hands to hold this item you are giving me    In terms of your code  you created a view  but never specified the size  You need a  dataGridView1 ColumnCount   5    Before trying to access any columns  Modify   DataGridView dataGridView1   new DataGridView     dataGridView1 Columns 0  Name    ItemID     to  DataGridView dataGridView1   new DataGridView    dataGridView1 ColumnCount   5  dataGridView1 Columns 0  Name    ItemID     See http   msdn microsoft com en-us library system windows forms datagridview columncount aspx

User · Answer

You re not adding columns to your DataGridView  DataGridView dataGridView1   new DataGridView     Create new grid  dataGridView1 Columns 0  Name    ItemID     refer to column which is not there    Is it clear now why you get an exception   Add this line before you use columns to fix the error  dataGridView1 ColumnCount   5

User · Answer

dataGridView1 Columns is probably of a length less than 5  Accessing dataGridView1 Columns 4  then will be outside the list

[c#] Index was out of range. Must be non-negative and less than the size of the collection parameter name:index

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