Why Does My Stored Procedure Return 'Procedure or function expects parameter which is not supplied'?

Stored Procedure Parameters: The Missing Piece

When attempting to insert data into a SQL Server database via a stored procedure, you may encounter the error: "Procedure or function expects parameter which is not supplied." This error indicates that a required parameter is missing from the stored procedure invocation.

Identifying the Missing Parameter

To pinpoint the problematic parameter, refer to the error message. It typically provides the name of the missing parameter, in this case, "@userID".

Confirming Parameter Existence

After verifying the stored procedure definition, you might notice all parameters are present. So, why the error? In this case, the code appears to be calling the "SHOWuser" stored procedure correctly.

Inspecting Command Execution

However, it is essential to set the CommandType property for the SqlCommand object to "StoredProcedure." This instructs the database that the command is executing a stored procedure. Without this setting, the database may try to execute the command as a regular query, and missing parameters could lead to the error.

Code Correction

The following code snippet demonstrates the necessary fix:

SqlCommand cmd = new SqlCommand();

cmd.Connection = dbcon;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "SHOWuser";

Possible Root Causes

Even when all parameter values are correctly supplied, you might encounter this error if the CommandType is not explicitly set. The error message can be misleading in such cases. However, carefully inspecting the code and understanding the intricacies of parameter passing should help resolve the issue.

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