Procedure expects parameter ‘@statement’ of type ‘ntext/nchar/nvarchar’.

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The error message “procedure expects parameter ‘@statement’ of type ‘ntext/nchar/nvarchar’” typically occurs when trying to execute a stored procedure or a SQL query that requires a parameter of type ‘ntext’, ‘nchar’, or ‘nvarchar’, but the provided parameter is of a different datatype or not provided at all. To resolve this error, you need to make sure that you are passing the correct data type for the ‘@statement’ parameter.

Let’s take an example to understand it better. Assume we have a stored procedure called ‘InsertData’ that expects a single parameter of type NVarChar. The purpose of this procedure is to insert a string value into a table. Here is an example of how the stored procedure might look like:


      CREATE PROCEDURE InsertData
        @statement NVARCHAR(MAX)
      AS
      BEGIN
        INSERT INTO MyTable (Statement)
        VALUES (@statement)
      END

In this example, the ‘@statement’ parameter is of type ‘NVARCHAR(MAX)’. Now, let’s say you want to execute this stored procedure in your code. Here is how you can do it using C#:


      string connectionString = "your_connection_string";
      string statement = "Hello, world!"; // The statement that you want to insert
      
      using (SqlConnection connection = new SqlConnection(connectionString))
      {
        SqlCommand command = new SqlCommand("InsertData", connection);
        command.CommandType = CommandType.StoredProcedure;
        command.Parameters.AddWithValue("@statement", statement);
      
        // Execute the stored procedure
        connection.Open();
        command.ExecuteNonQuery();
        connection.Close();
      }

In the above example, we first create a SqlConnection object and provide the connection string for your database. Then, we create a SqlCommand object with the name of the stored procedure (‘InsertData’) and the connection object. We set the CommandType property of the command object to StoredProcedure to indicate that we are executing a stored procedure. Finally, we add the ‘@statement’ parameter and its value using the Parameters.AddWithValue() method.

By executing the stored procedure in this way, you ensure that the ‘@statement’ parameter is of the correct datatype (‘NVARCHAR’ in this case), avoiding the error mentioned in your query.

Remember to replace “your_connection_string” with the actual connection string for your database, and “Hello, world!” with the actual statement you want to insert into the table.

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