Datagridview.datasource = datatable; [英] Datagridview.datasource = datatable;

问题描述

在我的代码中，每件事情都很好......当我执行此语句时，它显示错误



对象引用未设置为实例一个对象。



并显示异常NullReferenceException ....



请帮忙我...

提前致谢....

In my code every thing is good...When I am executing this statement it showing the error

Object reference not set to an instance of an object.

and showing an exception NullReferenceException....

please help me...
Thanks in advance....

推荐答案

无论你为数据表分配了没有数据的DataTable。

请设置一个断点并检查你的数据表是否有数据。

Hi,

whatever you assigned the DataTable that datatable having no data.
Please put a break point and check your datatable having data or not.

private void button5_Click(object sender, EventArgs e)
        {
           string str = comboBox1.SelectedValue.ToString();            
            Form6 f6 = new Form6();
            f6.Perform(str);
            f6.Show();           
        }

当我使用此代码时，它没有任何错误....

When i Used this Code it is not having any error....

private void button5_Click(object sender, EventArgs e)
        {
           string str = comboBox1.SelectedValue.ToString();
            Form6 f6 = new Form6(str);
            f6.Perform(str);
            f6.Show();
        }
</pre>

当我使用此代码时显示错误....

这里perform（）在form6中显示一个daatabase

When i used this code it showing the error....
here perform() display a daatabase in form6

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