.net - C# Transpose() method to transpose rows and columns in excel sheet

Question

I want to transpose rows and columns of an excel sheet and save it. I want to use C# transpose() method for this purpose. Can anybody tell how it can be used in C# with examples, what is the syntax, what object shoud be created to call transpose() method?

Thank you.

Answer 1

First you have to convert excel sheet to datatable and then programmatically transpose rows and columns of datatable.For converting excel sheet to datatable,you can search question on stackoverflow as it has lot of similar questions.For trasposing datatable below code works;

private DataTable GenerateTransposedTable(DataTable inputTable)
{
     DataTable outputTable = new DataTable();

     // Add columns by looping rows

     // Header row's first column is same as in inputTable
     outputTable.Columns.Add(inputTable.Columns[0].ColumnName.ToString());

     // Header row's second column onwards, 'inputTable's first column taken
     foreach (DataRow inRow in inputTable.Rows)
     {
         string newColName = inRow[0].ToString();
         outputTable.Columns.Add(newColName);
     }

     // Add rows by looping columns        
     for (int rCount = 1; rCount <= inputTable.Columns.Count - 1; rCount++)
     {
         DataRow newRow = outputTable.NewRow();

         // First column is inputTable's Header row's second column
         newRow[0] = inputTable.Columns[rCount].ColumnName.ToString();
         for (int cCount = 0; cCount <= inputTable.Rows.Count - 1; cCount++)
         {
             string colValue = inputTable.Rows[cCount][rCount].ToString();
             newRow[cCount + 1] = colValue;
         }
         outputTable.Rows.Add(newRow);
     }

     return outputTable;
}