how to edit data table column header names using c#?

Question

I have some logical block in my c# program,as i am new to c# programming. i have a data-table with duplicate header column names .I have to change my duplicate header like concatenate the name of the prior column to make these headers unique.Table names are coming dynamically. Current datatable ID |Name|Age| School | Name | state| Part| Country|Division|Part Expecting ID |Name|Age| School | Name+school | state| Part| Country|Division|Part+Division what i have tried and blocked here below public DataTable RemoveDuplicateRows(DataTable dTable) { string[] columnNames = dTable.Columns.Cast ().Select(x => x.ColumnName).ToArray(); for (int i = 0; i { columnNames[i] = columnNames[i].Split('.')[0].Trim(); } for (int i = 0; i { //create nested loop for compare current values with actual value of arr for (int j = i + 1; j { if (columnNames[i] == columnNames[j]) { var previous = columnNames[i - 1]; var current = columnNames[i]; columnNames[i] = current + previous; //blocked here //only one header is concatenating //how can i add this newly edited columns to my datatable } } } return dTable; //cant get updated coloumn headers }

Nisha Regil · Answer

In your code dont use the below lines for (int i = 0; i { dTable= headers from distinctArray } The distinctArray itself returns all the values in your required format.

Sujeet Raman · Answer

Hi nisha I have doubt here in your code:i need to replace the old headers with this new concatinated headers in the same datatable "dTable".I have values but just table headers has to change In my code i am taking the table headers like, string [] columnNames = dTable.Columns.Cast().Select(x => x.ColumnName).ToArray(); so how i can add for ( int i = 0; i { dTable= headers from distinctArray } i failed to add when i am doing like foreach ( string item in distinctArray) { dTable.Rows.Add(item); } return dTable; }

Nisha Regil · Answer

I have tried to replicate your requirement. I have taken a string array instead of DataTable string [] columns = { "Volvo" , "BMW" , "Ford" , "Mazda" , "Ford" , "Volvo" , "one" }; // All columns List string > newcolumnsList = new List string >(); // list for new array of columns String psearchString = "" ; for ( int i = 0; i { String searchString = columns[i]; int index = newcolumnsList.IndexOf(searchString); // check if column name already exists if (index == -1) { newcolumnsList.Add(searchString); } else { psearchString = columns[i - 1]; // get previous name. newcolumnsList.Add(searchString + "+" + psearchString); } } var distinctArray = newcolumnsList.ToArray(); // array as per expectation. // Create a new table with Dynamically adding the colums int table in loop below for ( int i=0;i { // } Please see it this is useful.

Sujeet Raman · Answer

the coloumn name is coming like name,name.1,name.2 i need to convert to like name.1 to name+previous

Nisha Regil · Answer

In DataTable if you have 2 columns with the same name it will throw error A column named 'Columnname' already belongs to this DataTable. Is there no error from Current Datatable with same columnnames?

Sujeet Raman · Answer

yes i am sure.All i need to make my coloumns unique using this methode.Adding prior column to the duplicate coloumn

Nisha Regil · Answer

Are you sure, you want to concat only the ColumnName and not the rowdata for the datatable?

how to edit data table column header names using c#?

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Answers (7)