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C change button corresponds to a method of checking whether the name exists in the database

2021-11-25 18:17:30 CSDN Q & A

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How to change the color of this button in the end , I've seen that what I've got has always been text
c# Change button correspondence Name Whether there is a check in the database




Refer to the answer 1:

Two questions ,1)string sqln = $""; You didn't write this query correctly . You can print it out and see .2)Datatable dtn = new DataTable(sqln); This just defines dtn, Did not execute query .




Refer to the answer 2:

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