How to Fix a 'Parameterized Query Missing Parameter' Error in Your Code?

Parameterized Query Missing Parameter Error

When executing a parameterized query that expects a specific parameter, it is essential to supply the corresponding value. In the code provided, the error arises because the parameter "@Parameter1" is expected but not provided.

To resolve this issue, the appropriate parameter must be added to the command. Additionally, if the value assigned to the parameter can be null, it is crucial to handle this scenario appropriately.

Consider the following改进e code:

cmd.Parameters.Add("@Department", SqlDbType.VarChar)

If (TextBox2.Text = Nothing) Then
    cmd.Parameters("@Department").Value = DBNull.Value
Else
    cmd.Parameters("@Department").Value = TextBox2.Text
End If

In this revised code, a parameter named "@Department" is added to the command, and its data type is specified as SqlDbType.VarChar.

For handling null values, the If conditional statement checks if the value of TextBox2.Text is Nothing (i.e., null or empty). If it is, the parameter value is set to DBNull.Value. Otherwise, the value of TextBox2.Text is assigned to the parameter.

With this modification, the code will properly handle null values, converting them to DBNull values that are acceptable to the database. As a result, the parameterized query will execute successfully without encountering the "parameter was not supplied" error.

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