How to solve "Object reference not set to an instance of an object?

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Best solution

Object reference not set to an instance of an object. Please Help to solve error

I am new to C#. Kindly tell me what`s wrong with this code. I am inserting data in data base using two input fields EndValueTextBox and StartValueTextBox . I am receiving following error. "Object reference not set to an instance of an object" private void buttonSave_Click(object sender, EventArgs e) { connection = new System.Data.SqlClient.SqlConnection(); da = new SqlDataAdapter(); try { connection.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename='G:\\C#.Net\\Forms...

Answer:

Your SqlDataAdapter is never assigned a connection to execute the query on. You need to associate the...

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Other solutions

How do I solve the problem of passing copy of reference of object, not actual reference, as an argument for a method in Java?

How can actual reference to an object to point null in a method, when we pass the object as an argument to a method? As Java always pass an object as a "copy" of actual reference rather than actual reference to object.

Answer:

Java does not have an "out" kind of parameter. You cannot change the reference used as a...

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Object reference not set to an instance of an object.?

I tried to show my Form2 by calling Form2.Show() but it says Object reference not set to an instance of an object. What do I do? Form2 code below: Public Class Form2 Dim location_rock As Integer = RectangleShape1.Location.Y Private Declare Sub Sleep...

Answer:

statements like this could be the cause: location_rock = location_rock + 2 if location_rock had a null...

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Object reference not set to an instance of an object in c#?

I am learning c#.net in home and learn site.my code System.Data.OleDb.OleDbConnection con; System.Data.OleDb.OleDbDataAdapter da; DataSet ds; private void Form1_Load(object sender, EventArgs e) { con = new System.Data.OleDb.OleDbConnection(); con.ConnectionString...

Answer:

What that means is something in ds.Tables[0].Rows[0]; is not set (or null) So either, the dataset is...

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What do you do when a box comes up that says object reference not set to an instance of object?

Answer:

in vb.net dim xyz as myclass=new class or dim xyz as new myclass you might have missed the new key word...

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Is it possible to travel faster than light with respect to the reference frame of space as long as you do not?

exceed the speed of light in reference to...don't know how to word it in a simple manner. Anyways, so the other day I was drunk and high when I had a series of thoughts: 1. it is impossible for ONE SINGLE OBJECT to exceed the speed of light... 2. but...

Answer:

I have to admit I only read the beginning and end of this. To answer your very last question, yes, you...

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How do I solve this Java code?

I am having trouble with this code. This is our last homework assignment and I am just stumped on how to solve it. Consider the "List" class, and its "Node" class, Now, assume that the Node class is changed to this: class Node { public...

Answer:

(There sure are a lot of LinkedList homework assignments lately)... Do you know compareTo() ? String...

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How avoid error "Object reference not set to an instance of an object"? asp.net c#.

Answer:

You must ensure that you have declared a definition of each control you're referencing on the .aspx...

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What does this mean?: Object reference not set to an instance of an object

Answer:

Cause one: Not declaring variables!

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How do you get DirectX 7 for VB to give you access to the object behind that 'unknown' interface?

Is There a way to use the DirectX7 object provided by VB without creating a reference to the DirectX7 for VB Library in your project. I am a huge fan of COM Automation and scripting and I'd prefer not to reference ANYTHING in any of my VB projects. When...

Answer:

Let's resolve this overdue question by bringing it to a vote.

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