Why Does My SQL Stored Procedure 'SHOWuser' Fail with a Missing Parameter Error?

Stored Procedure or Function Expects Parameter: Identifying the Missing Parameter

In the given scenario, an attempt to execute a stored procedure named "SHOWuser" in a SQL Server database fails with the error message "Procedure or function 'SHOWuser' expects parameter '@userID', which was not supplied." Despite verifying that the stored procedure definition does not have a missing parameter, the error persists.

To troubleshoot this issue, it's essential to carefully review both the stored procedure definition and the code that calls it. The error message explicitly states that the '@userID' parameter is missing, which suggests that the value is not being properly supplied when executing the stored procedure.

Upon examining the code, it's observed that the following line is missing:

cmd.Parameters.AddWithValue("@userID", Convert.ToInt32(i));

This line is responsible for adding the '@userID' parameter to the SqlCommand object and setting its value to the result of converting the integer 'i' (which holds the identity of the newly inserted user) to an integer. Without this line, the stored procedure cannot be executed as it lacks the '@userID' parameter value.

Additionally, it's always advisable to set the CommandType property of the SqlCommand to System.Data.CommandType.StoredProcedure before executing a stored procedure. This ensures that the command is interpreted as a stored procedure call rather than a plain SQL statement.

By adding the missing line and setting the CommandType property correctly, the stored procedure can be executed successfully with the correct parameter values. Revisiting your code and ensuring that all necessary parameters are supplied to the stored procedure will resolve the "expects parameter" error.

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