How to put row value in header in same line

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SQL-Server

My gridview as follows


ID Slipdate Slip No Transaction no Unit Paid Due TransactionItem

1 20-01- 1 1234 1 500 200 yes
2018
00:06:00

2 20-02- 2 4535 2 200 100 yes
2018
00:06:00


from the i want to change and output as follows

ID Slipdate Slip No Transaction no Unit Paid Due Transactionitem

1 2018-01-20 00:06:00 1 1234 1 500 200 Yes
2 2018-01-20 00:06:00 2 4535 2 200 100 Yes


from the above what changes i have to get the output

What I have tried:

My gridview as follows


ID Slipdate Slip No Transaction no Unit Paid Due TransactionItem

1 20-01- 1 1234 1 500 200 yes
2018
00:06:00

2 20-02- 2 4535 2 200 100 yes
2018
00:06:00


from the i want to change and output as follows

ID Slipdate Slip No Transaction no Unit Paid Due Transactionitem

1 2018-01-20 00:06:00 1 1234 1 500 200 Yes
2 2018-01-20 00:06:00 2 4535 2 200 100 Yes


from the above what changes i have to get the output