70-315 Developing and Implementing Web Applications with Microsoft Visual C# .NET Practice Exam

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70-315 Developing and Implementing Web Applications with Microsoft Visual C# .NET

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Demo Question 1.

You need to obtain the CGPA for students of the School of Business in a text format. Which of the following code fragments will set the Text property of a TextBox control to the value of the @CGPA output parameter? (Select the best choice.)

A. TextBox1.Text = (string) myCommand.Parameters("@CGPA").Value;
B. TextBox1.Text = myCommand.Parameters("@CGPA").Value.ToString();
C. TextBox1.Text = myCommand.Parameters("@CGPA").ToString();
D. TextBox1.Text = myCommand.Parameters("@CGPA").SourceColumn;

Display Answer

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Answer: A The Value property of the SqlParameter class returns the value of the specified output parameter. The (string) typecast ensures that the value is a string before assigning the value to the text box's Text property. It is invalid syntax to append ToString to the Value property of a SqlParameter object. The ToString property of a SqlCommand object will return the parameter name, not the value. The SourceColumn property will return the column name that is used for the Value property.

Explanation: