I am getting NullReferenceException at "int rowAffected=cmd.ExecuteNonQuery()" could anyone please solve my problem

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protected void btnFinish_Click(object sender, EventArgs e)
{
Panel6.Visible = true;
string fileType = filePhoto.PostedFile.ContentType;
//Response.Write(fileType);
if (fileType == "image/jpeg " || fileType == "image/jpeg" || fileType == "image/gif" || fileType == "image/png" || fileType == "image/bmp")
{
string fileName = System.IO.Path.GetFileName(filePhoto.PostedFile.FileName);

string serverFolderPath = Server.MapPath("Photos\\");
if (!Directory.Exists(serverFolderPath))
Directory.CreateDirectory(serverFolderPath);
string serverFileName = serverFolderPath + fileName;
filePhoto.SaveAs(serverFileName);
lblPhoto.Text = "File Uploaded successfully ";

}
else
{

lblPhoto.Text = " Please Select file of type *.jpeg/*.jpg/*.png/*.gif/*.bmp only!!!";
}
ViewState["Pic"] = "Photos/" + filePhoto.PostedFile.FileName;
string photoPath =Convert.ToString(ViewState["Pic"]);
lblDetails.Text += "

<img width='150px' height='100px' src='" + photoPath + "'>";
}

protected void btnConfirm_Click(object sender, EventArgs e)
{
string photo = Convert.ToString(ViewState["Pic"]);

// photo = ViewState["Pic"].ToString();
Label1.Text = photo;
if (cn.State != ConnectionState.Open)
cn.Open();

strSqlCommand = "instert into demo(id,img) values(1," + photo + ")";
int rowAffected = cmd.ExecuteNonQuery();
if (rowAffected > 0)
{
Label1.Text += " inserted ";
//Label1.Text += " "+image;
}
else
Label1.Text = "not done ";
}

Posted 29-Mar-15 0:34am

Bhavani Ch

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OriginalGriff · Accepted Answer · 2015-03-29T00:53:00

The only way you will get a null reference there is to not assign anything to the cmd - and your code doesn't.

You create a command string:

C#

strSqlCommand = "instert into demo(id,img) values(1," + photo + ")";

but you don't do anything with it. (and you can't spell "insert" :laugh: )
So try:

C#

strSqlCommand = "INSERT INTO demo (id,img) values(1," + photo + ")";
cmd = new SqlCommand(strSqlCommand, con);
int rowAffected = cmd.ExecuteNonQuery();

But please, don't do it that way! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead:

C#

strSqlCommand = "INSERT INTO demo (id,img) values(1,@PH)";
cmd = new SqlCommand(strSqlCommand, con);
cmd.Parameters.AddWithValue("@PH", photo);
int rowAffected = cmd.ExecuteNonQuery();