There is no row at position 1

how to Solve " There is no row at position 1. "

your datatable doesn't contains any Rows in it, thats why that error occurs,
to prevent it always use condition to check like that

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if(dt.Rows.Count>0)
{
//Do youe Stuff
}

 
1) Debug your code
2) Check is there any rows in your table DBCUSTOMERMASTER