This tutorial will guide you on how to determine if the primary key entered is already exist in the table. I created this tutorial in the hope to help newbie’s programmer solve this common problem.
Instead of displaying the default message cast by Visual Basic a message “Employee ID already exist. Please enter another Employee ID.” will appear.
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how to Textbox form click add button then msgbox (this number already exits in datagridivew enter another") in visual basic code
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any body guys helpme
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